The MSP (Malogabaritnyj Spetsialnyj Pistolet – small special pistol) is one of the very rare, truly silent pistols – when it is fired, the only sound it produces is the quiet “click” of a firing pin. Yet, this pistol has no silencer, as every specially designed cartridge 7.62mm SP-3, has an integrated silencing feature in the form of a gas-sealing piston that pushes the bullet and then locks the powder gasses within the strengthened case. The pistol is of a very compact and slick design, as it is intended for concealed carry and surprise use. It is of two-barrel derringer type, with tip-up barrels.
7.62mm SP-3 cartridge and spent SP-3 case and bullet, loaded into steel clip used for MSP pistol. Note that piston is of two-stage telescoped design.