Quote Originally Posted by ZERO THEORY View Post
I think Arma Lite and Colt might still make some collector's A1 uppers. But as far as your standard black rifle stuff of today, we're talking about 16" and 14.5" barreled uppers that usually sport mid-length and carbine gas systems, respectively.
Crap, I just realized I said upper in my original post... The lower is what confuse me, I thought M16A1 didn't have the ribs around the mag release?.