Does the Colt M4 come in an A2 Configuration....or is it A3 only? I'm thinking the latter, but would really prefer an A2. Suppose I can always buy a Colt A2 upper later on, and swap'em out....right?
Also, I've noticed that Jewell sells a trigger for big pins. Is this the one that is needed for the MT6400C?? I've heard that the Colt has larger dia pins....just want to make sure I know what I'm doing when ordering.