A very brief history of the internally suppressed, captive piston ammunition and firearms in Russia.
During 1950s, the famous Soviet gun designer Igor Stechkin5 was tasked to design several deep concealment, noiseless weapons for KGB and GRU6; He then produced an experimental SP-1 cartridge7, similar in concept to that of the Mitin brothers. It used a specially designed bullet which could be squeezed through a constricted bore with an entry (throat) diameter of 9mm and exit (muzzle) diameter of 7.62mm.
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Pretty neat. Weaponsman.com had an earlier post on a suppressed revolver (yes revolver) that used captured piston design to avoid the sound and fireball in standard revolvers and semi-autos. This was apparently very effective in suppressing the sound of the shot. It was originally designed for use by 'Tunnel Rats' in Vietnam, and was generally well received. And it also got good reviews from ranger and other special operations forces, who wanted more of them...so the Army never developed or produced them beyond the initial few test models sent to the field. ??
I don't think they were worried about that with this.
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