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The Soviet Union had made fairly extensive use of silencers on Mosin Nagant rifles during World War Two, as tools for snipers and recon scouts among others. In the mid 1950s a new silencer was put into development for the new 7.62x39mm family of weapons, called the PBS (Прибор Бесшумной Стрельбы; Pribor Besshumnoi Strelyby; Silent Shooting Device). This was originally intended to be a multi-weapon silencer, but the abandonment of the SKS and reliability problems with the RPD led to it being limited to just the AK. Compared to the Mosin Nagant silencers, this new design was much more difficult, as it had to allow the rifle to cycle reliably using specialized subsonic ammunition, and also continue to run reliably with the silencer removed and standard ammunition used. This led to the most unusual element of its design; a thick rubber wipe just in front of the muzzle to help boost back pressure.
The remainder of the design was pretty simple, with 12 plain flat plate baffles. The first production PBS model used a clamshell main body, but this was replaced by a solid tube on PBS-1 improved model in 1962. These suppressors were used until the late 1970s, when the 9x39mm cartridge was developed for better subsonic effectiveness, along with a number of unique new firearms designed for it.
Bramit Suppressor for Mosin Nagant: https://youtu.be/IrQdd31-Eh8
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