PSS: Russia's Silent Captive-Piston Handgun

Published on December 13, 2025
Duration: 1:30

This entry details Russia's PSS silent captive-piston handgun, as explained by Ian McCollum of Forgotten Weapons. It covers the unique SP-4 ammunition, the pistol's feeding mechanism, and its sound suppression capabilities, noting its sound profile is comparable to a suppressed .22 caliber firearm. The analysis highlights the mechanical compromises inherent in its design.

Quick Summary

The Russian PSS silent handgun uses unique captive-piston ammunition (SP-4) where an internal piston traps propellant gases after firing. This technology significantly reduces the sound signature, making it comparable to a suppressed .22 caliber firearm, though not completely silent.

Chapters

  1. 00:00Introduction to the PSS
  2. 00:17Feeding and Action Mechanics
  3. 00:27SP-4 Ammunition Mechanics
  4. 00:37Sound Suppression Reality
  5. 01:03Shooting Demonstration
  6. 01:12Conclusion and Limitations

Frequently Asked Questions

What makes the Russian PSS handgun silent?

The PSS achieves its silence through unique captive-piston ammunition (SP-4). An internal piston within the cartridge traps propellant gases after launching the projectile, drastically reducing the sound signature to a level comparable to a suppressed .22 caliber firearm.

How does the SP-4 ammunition work in the PSS pistol?

The SP-4 cartridge features a 155-grain projectile and an internal piston. When fired, the piston pushes the projectile out of the case and then seals the remaining propellant gases inside, preventing them from escaping and creating a loud muzzle blast.

What are the main technical specifications of the PSS Silent Handgun?

The PSS is a semi-automatic pistol chambered in 7.62x42mm SP-4 caliber. It holds 6 rounds and utilizes a captive-piston action for significant sound suppression, comparable to a suppressed .22.

Why isn't the captive-piston technology more widespread?

The captive-piston system requires numerous mechanical compromises in the firearm's design and ammunition. Furthermore, it doesn't achieve absolute silence, only heavy suppression, which limits its appeal compared to other specialized firearm solutions.

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