I have built several AR-15's as well as a couple 80% AR's. I am currently waiting for my Form 3 then the Form 4 to come through on a can (45Osprey) and I plan on using it primarily on a Glock 22 .40 S&w. I ordered the .45 can so I can in the future have the flexibility. I am thinking of trying to build a gun around the can. any tips? Pics?