With the increase in crime in the early 1990-s, the law enforcement forces of Russia found that a regular PM pistol has insufficient combat effectiveness, and the Kalashnikov assault rifles are often excessive in power. Submachine guns could be the best solution, but they were not yet in mass production, and therefore various OMON, SOBR and other units began to buy copied from the army, but quite capable APS. Even now, in the 2003 year, when there are various submachine guns, and more powerful pistols of the newest systems, many representatives of the "organs" still prefer Stechkin for its cheapness, wide availability of ammunition, and quite good combat characteristics. True, instead of heavy and uncomfortable in wearing regular holster-butts, it is often used open-type artisan or commercial holsters, which are much lighter and allow for quick removal of a pistol.
Pistol APS built on the basis of automation with a free gate. The double-action trigger and trigger mechanism allows for the opening of fire both by self-platooning and by preliminary manual cocking of the trigger. Manual fuse is located on the gate and when turned on blocks the drummer and the bolt. In addition, the fuse also serves as a translator of fire modes, allowing you to select single shots or bursts of fire. To achieve a reasonable rate of fire with a small mass of the bolt in the gun provides an inertial rate of fire rate, located in the handle. The sight of the original design has the installation range for 25, 50, 100 and 200 meters. The standard holster-butt of the closed type is made of wood (early versions) or plastic and adjoins the pistol grip. A steel magazine with a double row arrangement and an outlet of cartridges accommodates 20 cartridges, the magazine latch latch is located at the bottom of the handle.
On the basis of the APS in the 1970-ies for the special forces of the Army and the Ministry of Internal Affairs was developed a special version of the gun APSB, complete with an elongated barrel with a thread in the muzzle, allowing to install the device for silent shooting (silencer). APSB pistols were also equipped with a light detachable butt wire.