Not legally you cant. Even attempting to modify a gun to full auto will get you a few years in prison if caught or in possession of it. IF you knew any thing about gun smiting you would also know it against the law for anyone thats not a gun smith to make ANY modifications or repairs on any gun that don't belong to them. no ifs ands or butts about it. if a tool touches the gun its considered gun smiting. Its the reason a jeweler or engraver is no longer even allowed to make some one fancy hand grips, gold or silver plate a gun or even engrave it. Unless they are also a licensed gun smith.