The most powerful AR-15 rifles

89
The most powerful AR-15 rifles
Grendel Highlander Rifleman

Caliber - easy to get scared
Lose peace for good
By eye - thirteen millimeters,
More precisely - twelve and seven,
Half an inch - make you shiver
A creature of heaven and earth,
Half an inch of everything is separated
From the death of your enemy!
(Adam Lindsay Gordon)


Weapon and firms. How are inventions born?



Someone how, but quite often it happens in a dream. For example, one day I dreamed about a thermal machine for the manufacture of parts from foam, which was once praised by the magazine "Modelist-Constructor", and in the morning I just had to sketch and make it. In January 2001, British gunsmith Bill Alexander had the same “vision” that he had to give up everything here and go to the USA. And after all, in his homeland, Bill has developed dozens of new types of weapons and cartridges for him. But ... the man wanted to go even further.

And he came to the United States, and after years of design, testing and development, he managed to combine his powerful 50-caliber Beowulf cartridge (created in 2001) with the AR-15 light assault rifle. Then, together with Arne Brennan, he developed the 6,5 Grendel cartridge and then, again, based on the AR-15, created a rifle for it. So, on the basis of these two cartridges 12,7 mm and 6,5 mm and, accordingly, two for these rifle cartridges, the Alexander Arms® company was formed, which immediately won a niche for itself in the US small arms market. Although, it would seem, there is nothing in this market. But still other manufacturers of "arches" had to make room and give place to Alexander's company.


Heavy duty "Beowulf" and a number of cartridges of 12,7 mm caliber


And this is for comparison cartridges of caliber 5,56x45 and .50 Beowulf. It just becomes scary looking at it!

Alexander Arms® manufacturing facilities are located in the Radford Arsenal in southwest Virginia, and it is here that the 6,5 mm Grendel Highlander and 12,7 mm Beowulf are produced - by far the most powerful rifles in the AR-15 family on all the world.


Cartridges and magazines

The fact that the process of creating firearms is very complicated and there are no trifles in it is just very clearly shown by the example with the Grendel rifle. The company has spent a lot of time testing the materials for the shutter to get the most out of it. The fact is that this rifle uses a bolt of the same size as a rifle chambered for 5,56x45 mm NATO cartridges, but the end surface of the bolt has been increased from 0,376 to 0,439 inches.

For the AR-15 valve, back in 1957, the Carpenter 158 alloy with low sulfur and phosphorus content was chosen. The wear properties of this alloy were well known. However, such a composition made it quite sensitive to the heat treatment process and, if the regime was not maintained, the valves made of Carpenter 158 steel had no chances to serve for a long time. Unfortunately, it is impossible to simply look at the AR-15 shutter and determine whether the heat treatment process has been carried out correctly or not.


"Grendel Highlander"

Alexander Arms has tested many grades of gun steel and opted for 9310, noting that its bolts last longer than others. This metal contains slightly more sulfur and phosphorus than Carpenter 158 and this facilitates proper heat treatment. Steel 9310 also contains vanadium, which gives it a denser grain structure. And the dense structure of the metal makes cracking more difficult, so the valve lugs last longer. Now it is this steel that is used in every bolt of the Grendel rifle, which increases its life cycle.


Firm emblem and phosphated receiver surface finish

The bolt is very important, but any firearm is, first of all, the barrel. This rifle uses an 11 '' (279 mm) barrel, which gives the muzzle energy 200 yards (182 m) higher than any 5,56 mm muzzle bullet when fired from a 20 '' barrel ( 508 mm), which is certainly preferable in terms of range and penetration.


The fore-end of an absolutely fantastic design allows you to attach a variety of "body kits" to it, both in front and in the back. "Picattins" are stamped right on it!

Making a firearm faster and more comfortable to use is easiest by simply shortening the barrel. The vast majority of AR-15 rifles sold in the United States have been proven to have a short legal barrel (16 inches), which does not require paperwork under the National Firearms Act (NFA). And the reason for the popularity of short barrels is that with them ... "life becomes easier." The weapon with them is lighter, it is easier to guide it on the target, it is easier to transport it, and it is undoubtedly more convenient to store the "short barrel".


As you can see, it can be easily removed and can be replaced with something else ...

Therefore, the designers reduced the length of the barrel, leaving it exactly as many centimeters as would be enough to disperse the bullet and ... to place additional sights and optics.


The appearance of the shutter with a gas pipe and lugs

And now the Bureau of Alcohol, Tobacco, Firearms and Explosives (BATFE) has passed the Second Amendment, so now an even shorter barrel can be used on the AR-15 without having to pay an additional $ 200 tax. This is probably the first time in storieswhen the government bureaucracy saved the consumer's money, instead of taking it even more from him, and at the same time gave him the opportunity to get more pleasure from the weapon he had acquired.

As for the heavy rifle .50 "Beowulf", it was designed to effectively engage any large targets at short and medium distances. Combining the high reliability of AR-15 / M16 style weapons, it is also suitable for hunting wild pigs, and can also be used against moose, buffalo and bears. At the same time, this weapon is used not only by hunters, but also by hunting control bodies.


Muzzle brake compensator

Semi-automatic light carbine "Beofulf" with the characteristics of a rifle of caliber 45-70, but for a lethal caliber .50, has also found wide application in the military and law enforcement agencies. The external ballistics of this cartridge is well suited for shooting in urban environments, where its bullets can successfully disable both vehicles and attackers wearing body armor. In this case, the windshield of the car does not affect the trajectory of this bullet, as well as the body panels. That is, as in the case of the 9-mm "GXNUMX", from which the infamous Bonnie and Clyde were killed, this weapon will not allow criminals to hide inside the car from the fire of law enforcement officers.


The appearance of the Beowulf rifle

The Beowulf rifle is also based on the standard Alexander Arms receiver. But only its upper part has slightly changed dimensions of the ejection hole to ensure 100% reliability of the ejection of a case that is thicker than the 6,5 mm cartridge. The barrel is 11-inch, made of chrome-molybdenum vanadium steel and has high strength characteristics.


Another muzzle brake compensator


And finally, this one ... just removed from the PTRD!

Free-floating forend from Manticore Arms Transformer. Its design is such that it allows you to attach a lot of various accessories to it.

Well, and of course, for the commercial success of a weapon sold on the market ... its color is of great importance. The days of gloomy monochromatic weapons, enlivened, say, only by the light color of polished wood, are long gone today. Now the trend is color weapons, with a stock and forend of various colors, up to bright red.


And this is how this muzzle compensator looks like on the barrel of a rifle.

So Alexander Arms® is in no way inferior to others in this regard. The paint options she offers to potential buyers include dark green, dark earth, titanium, burnt bronze, cobalt and sniper gray, although black is still used as and before. Going towards the consumer, the company even released a sample with a wooden unregulated stock, a pistol grip and the same wooden forend (!) Made of walnut wood. However, outwardly, it does not look so impressive as the most recent "modern" samples.

Rifle "Ulfbert" .338 Lapua Magnum stands apart in the row of Alexander's rifles. It is designed to fire a special sniper cartridge 8,6 × 70 mm at a "growth target" at a distance of up to 1800 m. It was used in Afghanistan, Iraq and even Ukraine. But still, she is not, so to speak, the face of this company.

PS


Photographs by Mark Fingar were used to decorate the material.
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89 comments
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  1. +14
    20 2021 June
    I shot from 458 sokom. The return is still. Another 450 bushmaster in the same gate. But very expensive ammunition, not to mention rifles. If you have your own oil rig and the desire to pontoon in front of friends, you can buy it, but there is not much sense.
  2. -6
    20 2021 June
    I like Kalash in golden color more ... beauty ... well, it's a matter of taste.
    Of course, such a powerful rifle in close combat is not very good, the bullet will ricochet and fly back to the forehead ... it will blow half of the head.
    How recoil with such a powerful cartridge affects the accuracy of shooting, you can't take a lot of ammunition on the route.
    What is the survivability at pollution and low temperatures?
    Thank you Vyacheslav for the article. hi
  3. +14
    20 2021 June
    I liked the article. good
    I heard about the AR-15 automation based on the direct action of the powder gases directly on the bolt carrier, and, about the modification based on the action of the powder gases through the piston on the bolt carrier.
    PS This Bill Alexander is a great lover of myths and legends, he connected two ancient enemies of Beowulf and Grendel. wink
    1. +4
      20 2021 June
      Quote: Lynx2000
      ... about the modification based on the effect of powder gases through the piston on the bolt carrier.

      If I remember correctly, such an automatic rifle is the HK416, it has a gas piston.
      1. +1
        20 2021 June
        Quote: Nemo
        If I remember correctly, such an automatic rifle is the HK416, it has a gas piston.

        Also Zig-Sauers of the 516, 716-Gen-2 and MCX series (though the last AR-15) are only half.
  4. +4
    20 2021 June
    I understand that the article is translated, but it was necessary to mention that, according to the same principle, the Ukrainian wunderwolf builders from the AR-15 made their own sniper "Zbroyar-10" chambered for 308 rounds. Moreover, they want her to replace the SVD in their Armed Forces. Those. to introduce a rifle, one can say of a single production and, accordingly, at a very high price due to the imported barrel and other components, and cartridges, instead of the technologically and tactically perfect SV Dragunov.
    1. -6
      20 2021 June
      They want Kakly in nature, so they unify the calibers. Moreover, they do not and will not have their own cartridge production.
    2. +1
      20 2021 June
      Ukrainian wunderwolf makers from AR-15 made their own sniper "Zbroyar-10" for 308 rounds. Moreover, they want her to replace the SVD in their Armed Forces. Those. to introduce a rifle, one might say of a single production

      It was also replaced, there is no SVD in the Armed Forces of Ukraine, but not only a single zbroyar.
    3. 0
      22 2021 June
      the 308 shotgun uses the base AR 10, not the AR 15
      1. 0
        22 2021 June


        comparison of the 5,56 receiver and the 308 caliber receiver
    4. 0
      July 12 2021
      Variants 308 are made on the basis of the Ar-10, this is an independent system, it is not necessary to identify the AR-15 and AR-10, only the butt tube is the same in them
  5. +6
    20 2021 June
    Interestingly, the Ar15 allows you to make rifles for various popular rifle calibers and get a good analog SVD ... even more powerful and more accurate (depending on the cartridges). And the AK scheme does not allow ... The Yugoslavs only tried to make a sniper rifle ...
    1. +1
      20 2021 June
      Quote: Zaurbek
      And the AK scheme does not allow ...

      "Kalashnikov sniper rifle, SVK - a prototype sniper rifle proposed by MT Kalashnikov in 1959 ...." SVK

      SVK-2016
      The Kalashnikov Sniper Rifle, a sniper rifle adopted by the Russian Armed Forces in 2016, began to gradually replace the old SVD. It is based on the SVK system, which was proposed in 1959 by Mikhail Kalashnikov.
      The length of the weapon and the mass have been reduced. For SVD, the length was 1225 mm, and for SVK-2016 - 1205 mm. High accuracy is noted when shooting. The rifle is also suitable for close combat conditions.
      Aim range: 1200 m
      Scatter at 100 m: 30 mm
      This is from wiki
      For me, this is how the SVD looks more solid.
    2. -1
      21 2021 June
      SVD is reliable and can handle bad gunpowder. therefore not analog. different classes of reliability. svd for a big war and a line infantryman. on the basis of AR15 only for good gunpowder. and not for a big war.
      1. +1
        21 2021 June
        Is it just that they make massive amounts of good powder?
        1. -1
          21 2021 June
          yes they are now attached to good gunpowder. but I mean that there is a different design and different reliability inherent in the design. it is like an all-wheel drive KAMAZ and a wheeled tractor with a cart. similar but still the purpose is different
          1. 0
            21 2021 June
            That's right ...... but the saturation of armies with such a rifle and and sights is growing ....... and we, corny, will lose more soldiers .... and the SVD still have the same barrels, cartridges and pso -one....
            1. -1
              21 2021 June
              for a soldier, a quality SVD or SVK with a quality cartridge is enough. on sights not in the subject. snipers have Orsis T5000. As I understand it, now the chip is a smart sight, like in a tank, it measures the distance, pressure, humidity, temperature, wind, speed and direction of the target and provides a hit from the first shot. as for the cartridge and weapons before and available are sufficient, subject to quality. and vice versa - give the AP15 for $ 500 with any scope and cartridge to a soldier and the soldier's defeat is guaranteed. or AP15 for $ 4000 and a cartridge on dirty gunpowder will also be bad. I wanted to say that the success of Marksman in the near future is not in AP15. there are enough high-quality svk svd cartridges and a modern sight. the cartridge may still be even stronger.
              1. 0
                21 2021 June
                There should be at least an AK with a heavy barrel and a sight ... and something like SVD with modern sights x8 or x10 (with night lights), and for specialists something like Orsis, but factory (mass) and at a price not like an airplane. Orsis is a piece expensive product.
                1. -1
                  22 2021 June
                  ( mass) and at a price not like an airplane. Orsis is a piece expensive product.

                  heavy Kalash-svk, t5000 for an accurate barrel seems to be not expensive. there are not enough smart all-weather sights and maybe the cartridge was praised more powerful here, it seems 408. it remains to saturate the army of t5000 and SVK
    3. The comment was deleted.
    4. 0
      27 2021 June
      Who told you that? AK allows, moreover, without increasing the size of the box, unlike AR, to make weapons up to 30-06 - The same Vepri.
  6. +1
    20 2021 June
    Krasava !!!! good
  7. -2
    20 2021 June
    A full hat, not a weapon. Such a cartridge is good for hunting, since, thanks to its large caliber, it transfers all the energy to the victim, without piercing the carcass through and through. Moreover, when hunting bears, wild boars and elk, they usually shoot at a distance of up to 100 meters in the Russian taiga conditions. And in the African savannah they shoot no further than 300 meters. And therefore, the high muzzle velocity of the bullet is not particularly important, the energy of the bullet is more important. But for hunting, the ergonomics of the P-15 with a pistol grip are not particularly convenient. It turns out that the R-15 with such a cartridge is useless as a military weapon, and uncomfortable as a hunting weapon.
    1. +6
      20 2021 June
      The United States has a solvent population and a developed civilian arms market. The fans are in demand for a variety of firearms monsters that are inapplicable neither in hunting, nor in military affairs, but simply to shoot at a shooting range, to brag to the same friends.
      1. +2
        20 2021 June
        Well, only as an exotic weapon, for which the Americans are so greedy. Outside the United States, these weapons will not be in any demand.
    2. +1
      20 2021 June
      In the Russian Federation there is an analogue of .50 caliber .... also with a silencer. Not a hat?
      1. -4
        20 2021 June
        It is suitable only as a sniper weapon with a silencer, at a muzzle velocity of 300 m / s it has energy at a 50-gram bullet of 2250 J, which allows effective firing at a distance of up to 400 meters.
        1. +2
          20 2021 June
          50 gram bullet

          there are 76 grams
  8. +5
    20 2021 June
    When I see the M-16, AR-15 and their modifications, I am delighted with the genius of amerovskoy weapons designers! Particularly indescribable joy for me is the button for releasing the shutter on the right side. According to amerovskoy statistics, about every tenth fully equipped magazine, the cartridge is not sent into the chamber under normal operating conditions. Those. in the absence of dust, grease, negative temperatures and the like, the first cartridge of the magazine stays stably stuck at the entrance to the chamber. Therefore, without this button, well, nothing. Super!
    1. +3
      20 2021 June
      Therefore, without this button, well, nothing. Super!

      Get fucked up! belay
    2. +5
      20 2021 June
      Quote: Old electrician
      When I see the M-16, AR-15 and their modifications, I am delighted with the genius of amerovskoy weapons designers! Particularly indescribable joy for me is the button for releasing the shutter on the right side. According to amerovskoy statistics, about every tenth fully equipped magazine, the cartridge is not sent into the chamber under normal operating conditions. Those. in the absence of dust, grease, negative temperatures and the like, the first cartridge of the magazine stays stably stuck at the entrance to the chamber. Therefore, without this button, well, nothing. Super!

      As far as I know, the problems are related to the supply from the store, and therefore they charge 2 cartridges less, and so it is quite a reliable machine, and we use it very actively ... in fact, any weapon is a complex mechanism that requires correct operation and observance of nuances ...
    3. +5
      21 2021 June
      At about every tenth fully loaded magazine, the cartridge is not sent to the chamber under normal operating conditions. Those. in the absence of dust, grease, negative temperatures, and the like, the first cartridge of the magazine stays stably stuck at the entrance to the chamber.

      Of course, we certainly won't see proofs for these next bad fantasies, will we?
      It is clear that the above is written absolute nonsense. We will probably start with the fact that according to the military acceptance standards of the US Armed Forces MIL-DTL-70599B dated January 20, 1994, the maximum allowable number of any delays in firing for the M4 / M4A1 assault rifle is 9 per 6000 shots for any individual sample from a control group of 4 assault rifles and 22 for 24 shots (000 shots from each of the machine guns) for the entire control group. If the requirements are not met, the ENTIRE batch of machines is rejected, acceptance does not pass and is returned to the manufacturer (of course, without paying for the order).
      Now where did the notorious "closer button" come from, on whose initiative and why. Actually, we should start with the fact that neither the AR-10 nor the original AR-15 had it. The designer did not see the need for it. The representatives of DAPRA did not see the need for it either.
      The army generals insisted on including this option in the design. The reason for this was not at all related to the design of the AR15 / XM16 itself, just on the M1 Garand and M14 rifles that were previously in service there was an option (due to the fact that the bolt cocking handle was rigidly connected to the bolt carrier), if necessary, "send" shutter manually. In the case of the M1 "Garand" with its batch loading, it was quite regularly needed in practice - when loading a new batch to replace the expended one, the soldiers, in order to avoid an unpleasant blow on the fingers, held the rifle bolt handle with their palm. So, when the handle was released, the bolt did not always go forward as expected - sometimes it had to be pushed manually (after which the bolt closed and the rifle worked normally). Previously, the inability to manually close the bolt manually served as one of the reasons to reject a competitor to the M14 - the T48 rifle (nee FN FAL), so in order to accelerate the harmonization of uniform requirements for weapons, the notorious "bolt release button" was added to the XM16.
      1. -1
        21 2021 June
        Quote: Terran Ghost
        At about every tenth fully loaded magazine, the cartridge is not sent to the chamber under normal operating conditions. Those. in the absence of dust, grease, negative temperatures, and the like, the first cartridge of the magazine stays stably stuck at the entrance to the chamber.

        Of course, we certainly won't see proofs for these next bad fantasies, will we?
        It is clear that the above is written absolute nonsense. We will probably start with the fact that according to the military acceptance standards of the US Armed Forces MIL-DTL-70599B dated January 20, 1994, the maximum allowable number of any delays in firing for the M4 / M4A1 assault rifle is 9 per 6000 shots for any individual sample from a control group of 4 assault rifles and 22 for 24 shots (000 shots from each of the machine guns) for the entire control group. If the requirements are not met, the ENTIRE batch of machines is rejected, acceptance does not pass and is returned to the manufacturer (of course, without paying for the order).
        Now where did the notorious "closer button" come from, on whose initiative and why. Actually, we should start with the fact that neither the AR-10 nor the original AR-15 had it. The designer did not see the need for it. The representatives of DAPRA did not see the need for it either.
        The army generals insisted on including this option in the design. The reason for this was not at all related to the design of the AR15 / XM16 itself, just on the M1 Garand and M14 rifles that were previously in service there was an option (due to the fact that the bolt cocking handle was rigidly connected to the bolt carrier), if necessary, "send" shutter manually. In the case of the M1 "Garand" with its batch loading, it was quite regularly needed in practice - when loading a new batch to replace the expended one, the soldiers, in order to avoid an unpleasant blow on the fingers, held the rifle bolt handle with their palm. So, when the handle was released, the bolt did not always go forward as expected - sometimes it had to be pushed manually (after which the bolt closed and the rifle worked normally). Previously, the inability to manually close the bolt manually served as one of the reasons to reject a competitor to the M14 - the T48 rifle (nee FN FAL), so in order to accelerate the harmonization of uniform requirements for weapons, the notorious "bolt release button" was added to the XM16.

        during a tense fight on good powder, even a Kalash, due to carbon deposits, will require ramming with a foot. the AP15 construct directly runs into "carbon" troubles. and if it gets cheaper gunpowder like in Vietnam? here amerskie generals were right.
        1. +3
          21 2021 June
          Well, here's how - systems with a "direct" gas outlet, they, in principle, alas, differ in increased (in comparison with systems with a gas piston) sensitivity to the quality of gunpowder and lubricant.
          It's just that the American military department managed to get used to the fact that the enterprises of the military-industrial complex of the United States, both in the First World War and in the Second World War, worked essentially "in greenhouse conditions" (compared to the typical working conditions of the military industry enterprises of the Soviet Union during the Great Patriotic War Wars are just that).
          Therefore, the designer Y. Stoner himself, and the design engineers of the Colt company, sending the first batches of XM16 rifles, were most likely sure that the composition of the gunpowder in the cartridges would be "correct, according to the manufacturer's recommendations." Probably, they did not lay on the other in their forecasts.
          With the domestic AK, the situation is exactly the opposite. And Mikhail Timofeevich himself, and officials of the GAU (Main Artillery Directorate) Min. defense of the USSR to the Great Patriotic War had the most direct touch. And therefore, most likely, they inevitably proceeded from the understanding that "in combat conditions" instead of normal gunpowder, there may be "dried chicken droppings" in cartridges, and the lubricant will not be "specially recommended by the weapons manufacturer", but the one that is available ... Up to the used engine oil from a tank engine.
    4. 0
      27 2021 June
      What are the statistics? do not bother referring to give otkel you got it? AR, of course, is inferior in reliability and survivability of the AK, but there is no need to repeat the stories of a century ago - "forward assist" appeared on the M16 at the request of the military, and it was not connected with delays, but with the fact that the warriors drew attention to the fact that in the Unlike the same M14, it is not possible to manually cover it, since the cocking handle is not rigidly connected to the frame, and works only in one direction.
    5. 0
      July 12 2021
      Well, you are exaggerating the probability of failure, but there really is a problem. As well as store breakdowns In general, the stores in the AR-15 are too thin, not like the AK system. Therefore, steel is still in use, they have better strength than plastic ones.
      There is nothing wrong with the messenger itself
  9. Thank you, Vyacheslav Olegovich for the interesting Sunday article. Eck, you managed to "jump" from the late 19th century to the modern one.
    Personally, I have an ambivalent attitude towards ARCs, but in 50 caliber .... Yes!
    1. +11
      20 2021 June
      Good morning, Nazarius. I do not choose the material for publication. There are 6 of them in the "drive". You could choose any one, but the editors chose this one. They know better!
      1. 0
        20 2021 June
        And how does such a .50 cal cartridge compare with a similar Russian one? For a rifle with a silencer which one?
      2. +4
        20 2021 June
        Vyacheslav, thanks for the information. hi
        It was interesting to read, but somehow I do not see the possibilities for using these "weapons" in real combat conditions. But Americans love such toys and buy them with pleasure, and for health, if there is extra money. smile
        1. +5
          20 2021 June
          Quote: Sea Cat
          But Americans love these toys and buy them with pleasure.

          Exactly...
  10. +1
    20 2021 June
    https://m.youtube.com/watch?v=w4kIdn3Tljk
    Video of this rifle shooting in automatic mode (at Matt's ranch).
  11. 0
    20 2021 June
    The system is similar to our "Exhaust". True, not silent, but the essence is similar. Ammunition "Beowulf" with an energy of 3200 J. Ours is subsonic, but the bullet is heavier.
    1. 0
      July 12 2021
      So "noiselessness" is achieved by installing an appropriate muzzle device
  12. -5
    20 2021 June
    Beowulf is bullshit. It was necessary to do it immediately under 12,7x108. Or even under 14,5. Large caliber does not tolerate compromise.
    1. +7
      20 2021 June
      All of the above are compromises: a true American must make a rifle chambered for 30 × 173 mm from the GAU-8 Avenger. wassat
      1. -2
        20 2021 June
        This is too much, it is not the business of the shooter to meddle in the artillery. But to toil with this small-sized Beowulf cartridge, when there are really large-caliber ones, is really pampering and bad taste.
        1. +3
          20 2021 June
          Quote: Basarev
          This is too much, it is not the business of the shooter to meddle in the artillery.

          For a normal person, yes ...
          However, Americans love to shock the public. :)
        2. -1
          21 2021 June
          like beowulf and 12,7x108 fl are completely different things. beowulf is almost a saiga 20k bullet, a little more accurate. and the cartridge of the heavy machine gun is slightly stronger. which means you need a mass to damp the recoil. weapons weighing 5kg and 25kg floor like different classes?
    2. 0
      20 2021 June
      You are welcome)))

      https://www.youtube.com/watch?v=-XKeRjX9Vbs

      https://www.youtube.com/watch?v=B7gavxEMNOw
  13. +11
    20 2021 June
    For the AR-15 valve, back in 1957, the Carpenter 158 alloy with low sulfur and phosphorus content was chosen. The wear properties of this alloy were well known. However, such a composition made it quite sensitive to the heat treatment process and, if the regime was not maintained, the valves made of Carpenter 158 steel had no chances to serve for a long time. Unfortunately, it is impossible to simply look at the AR-15 shutter and determine whether the heat treatment process has been carried out correctly or not.
    ...
    Alexander Arms tested many grades of gun steel and opted for the 9310 grades, noting that its bolts last longer than others. This metal contains slightly more sulfur and phosphorus than Carpenter 158 and this facilitates proper heat treatment.
    Steel 9310 also contains vanadium, which gives it a denser grain structure.

    Vyacheslav Olegovich, avoid such special questions in your articles, because here you need special knowledge, otherwise it turns out, to put it mildly, nonsense.
    Let's start with the fact that the content of sulfur and phosphorus in steel 9310 is not more, but less than in Carpenter 158 - 0,025% versus 0,030.
    Secondly, 9310 steel does not contain vanadium. It contains molybdenum. And Carpenter 158 has no molybdenum. It is he who in this steel contributes to grain refinement, increases the hardenability of steels by heat treatment, increases fatigue strength, slows down the onset of temper brittleness, increases corrosion resistance, and reduces pitting (pitting) corrosion.
    Steel 9310 is a more modern steel with better mechanical properties. But also more expensive. Therefore, hundreds of American small manufacturers, not constrained by budgetary constraints and the need to comply with MIL-SPEC requirements (basic technical requirements for purchased equipment (equipment), both purely military and civilian, developed taking into account the requirements of the US Department of Defense), use this steel, along with with other modern steels, for the production of closures.
    And finally, the chemical composition of steels that would allow heat treatment without observing strict parameters does not exist. But the methods of quality control of heat-treated parts are just there.
    1. +4
      20 2021 June
      I copied it from their prospectus and, you see, it is difficult to make a mistake in the translation. Sulfur, phosphorus, vanadium are translated from English without problems.
      1. +6
        20 2021 June
        I copied it from their prospectus and, you see, it is difficult to make a mistake in the translation.

        I am far from thinking that the prospectus has been drawn up illiterately. Obviously you are missing something.
        1. +4
          20 2021 June
          Found. This is not their prospectus. This is an article in Guns & Ammo magazine "Alexander Arms 6.5 Grendel Highlander Pistol Review".
          It turns out that information in such logs must be rechecked due to the presence of errors.
          The 9310 steel also contains vanadium

          9310 steel is written to contain vanadium.
          And this is the composition of steel 9310. There is no vanadium.

          And this is Carpenter 158, for comparison with phosphorus.
          1. +2
            20 2021 June
            You see, I don't even remember where, what I took. But - yes, this is the article! But to check every such little thing ... especially in the field of metallurgy ...
  14. +8
    20 2021 June
    And this is for comparison cartridges of caliber 5,56x45 and .50 Beowulf. It just becomes scary looking at it!

    Well, if it's scary, then what to say about it?

    For comparison - .700 nitro express and 5,56x45.
  15. -3
    21 2021 June
    If I choose, I would take the AKM: power, reliability, and let us leave the argument about the best accuracy of the M16 with the curved ones.
  16. 0
    21 2021 June
    And finally, this one ... just removed from the PTRD!

    EMNIP on the PTDD had a single-chamber brake ...
  17. -1
    21 2021 June
    I got the impression that this is a variant of the boar saiga for hunting and sports. No more. The rest is advertising
  18. +1
    27 2021 June
    The article is an example of cheap propaganda from the other side - which AR is good and which AR is bad, it turns out that a "superpowerful" cartridge can be used on a good AR. And now let's figure it out - the locking unit is calculated not for the hypothetical power of the cartridge, but for the maximum pressure, and here the dog rummaged - the maximum pressure of .50 Beowulf coincides with the maximum pressure of 5,56X45 simply because the form factor of the locking unit AR15 does not allow it to be strengthened without changes in the geometry of the receiver, and here is a miracle and the AK system allows this to be done, for the heaviest rifle calibers such as 30-06 or 7,62X54 use the front liner from the RPK74 and the third combat stop on the bolt without significantly changing the geometry of the box.
    AK-308 chambered for 7,62 NATO rifle cartridge
  19. 0
    July 12 2021
    The AR-15 system failed to make friends with the 6.5 Grendel cartridge. Very small resource. The Americans had to buy a weakened version of the 6.5 Grendel cartridge at the BPZ so that he did not break the Arch so quickly (well, or twist the weakened, not full power, what the cartridge is capable of). The reason - who does not know - is banal - there simply is no "meat" for a more powerful cartridge. According to the mind, it was necessary to completely redesign the rifle for 6.5, it would be a large-scale copy of the AR-15 (or it would be better to change the engine to a gas-piston), but not a single detail except the butt and the pipe in it would fit the AR_15. But they took the path of unification with the existing one (so the work is too significant)
    About 50 Beowulf is not in the know, but I'm sure everything is the same or even worse there)
    For Grendel, the native Kalashnikov is better suited, or the new carbine of one so far little-known (but well-known in narrow circles) Russian designer, which does not yet exist in metal, but has already been worked out as a concept.
    No money for a startup)
  20. 0
    July 15 2021
    [quote] [/ quote] Forend, free floating

    It's like, I wonder

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