Dozer, thanks for clearing that up, I had been hunting for the details on Colt pin sizes. I'm busy with several projects, and there is parts swapping involved. The Colt lower is a preference of a friend, and I need to convince him that it's just a name. At least if you want to use all of the same parts you just took out of another lower. I will prolly head to Bushy, RRA, or DPMS.