Yea I am aware that its 7.62x39 gas . he actually used the cut barrel on a AMD 65 kit. I just really liked the whole guide rod set up he had. Im going to do a blow back or two and thought it wold be nice to loose the gas tube and block. I want to try a 17 hmr with a one piece carrer and bolt with a home made piston. this might be a way to make it work better.