This pistol is one of the MANY 6P35 you'll ever heard about. I think this to have been manufactured by TSNIITOCHMASH. According to Mr. Maxim Popenker, webmaster of HTTP://WORLD.GUNS.RU, which kindly sent me additional informations (NOT THE PICTURE), the denomination "6P35" was due to the post-soviet mania for secrecy. This denomination was given to ALL the handguns which were submitted at the "GRACH" trial (the one for the NEW .9x19 russian army and police's service pistol, which was won by the IZHMASH MR-442 series). This UGLY gun has a strange (for a .9x19 handgun) floating barrel, firing from a closed bolt position... Mr. Popenker said: "Thank God this ugly pistol didn't attract the russian military".
Picture and Information from: PIERANGELO TENDAS