The smaller roll punch, in this set, sucks! Mine was not machined correctly on the end and it messed up the roll pins. I ended up buying a AR punch set, can't remember the maker at the moment.
@ET762AR, I had this very same problem building mine. I was using a cmc drop-in trigger. I replaced with milspec and worked better, but now I have a little sticky reset. It's a cmmg trigger group which I have been told are crap. The cmc didn't have the hammer spring loaded in correctly so now I...