I have a ar9 with a psa lower, with a mag block that takes colt mags. I'm using a Aero prescision BCG with a KAK extended buffer. It has a 556 buffer spring now, but will probably go to a 308 spring if the need arises
A few months ago l decided on a CM 9 for edc/ if I have my pants its with me gun. Others have reviewed this and I'm just putting in my 2 cents. It's light, easy to carry and has been totally reliable. I just broke it down to clean after about 1k rounds of various manufacture, including ball...