it shoots fine and the pins are tight, I just didnt know if it was possible to for the gas block to be hammered forward regardless of the pins being in, and as for the space I dont remember looking that hard so it might have been their before but like I said I wasnt positive, and ya, I feel the same way about that rail system but I had gotten it cheap so I figured I could just replace it if I didnt like it. What would you suggest I look into buying if I wanted to get a tri rail system?