PSS: Russia’s Silent Captive-Piston Handgun

The PSS is a semiautomatic pistol using captive piston ammunition to achieve a comparable level of sound suppression to a .22 pistol with a good normal suppressor. It was developed to replace a couple multi-barrel derringer style captive piston pistols in Soviet use, with the semiautomatic action and (6-round) detachable magazines making it suitable for a wider variety of missions than the previous guns.

It was given the GRU catalog designation 6P28 and entered service in 1983. It fires a cylindrical steel projectile weighing 155 grains at about 620 fps, with a noise of 122 dB (1m left of the muzzle) as measured by silencer legend Phil Dater. Mechanically, the design takes its fire control system from the Makarov but uses a floating chamber system to cycle reliably with the unique ammunition. After the fall of the Soviet Union, the pistols were available for commercial export by Russian state-run export companies, although that ended in 2018. In Russian service, the PSS was replaced with the much improved PSS-2 in 2011.