Sirs: I am curious to know what kind of barrels are used in the COLT Part Number SP401397, which I notice Brownells has in stock. Is it a Government Profile or a HBAR barrel? I'd also like to know about the uppers Brownells is selling with 14.5 (SP40165) and 11.5" (Colt Part number: 64785) barrells as well.. When I try to get this all figured out on my own I tend to get rather hopelessly lost googling and what-not. Are they government profile or the heavy barrel profile, which I believe is the HBAR. I'm exploring options for a new AR rifle. Thanks for any information you may have.
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