JustinJ
Member
There is supposed to be a little bit of play between a milspec type upper and lower, so if there is NOT, there is more likely to be some kind of dimensional quirk. It might take a few hundred rounds for it to get broken in.
Play may be common and one can argue wether or not it matters but it has nothing to do with "supposed to". If play is supposed to be there I gota wonder why Colt included an accuwedge with my 6720 and said in the manual to use if play is present.