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In 1967, the Tula arsenal introduced a specialized silenced version of the Makarov for covert use. This was a very effective pistol, and its design was also very heavily changed from that of the regular pistol. With a twopart silencer surrounding the barrel, the recoil spring had to be moved to a location inside the grip panels. It was still chambered for 9x18mm Makarov though, and used standard Makarov magazines. Not much official information has been published on the PB it may actually still be in production today and so I don't have any good production numbers to provide.
Many thanks to the IRCGN (Institut de Recherche Criminelle de la Gendarmerie Nationale) for allowing me access to film this hardtofind silenced pistol for you!
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