I own a Colt AR-15 & Armalite AR-10, love them both. Neither have ever jammed on me nor given the first problem. This may be more due to my oiling the shit out of the BC rather than any quality level of their mfgrs. >gg<
I have read of several owners in here having BM problems & a few with Armalite problems. I have not, however, read of any Colt problems. Is Colt perfect? Hardly. They do seem to be a bit better than BM though.
Quite frankly the different pin size brouhaha has never given me the first cause for reflection, not one.
People say the Colt will be worth more on resale & it's true, they will. Some say they'll never sell theirs, yadda yadda yadda, but who can really ever say never? There is definitely the mystique of owning a Colt that BM or even Armalite can never hope to match, IMO.
My .o2