I bought my first AR from a freind. It is a Colt carbine with a lower marked Match HBAR and Sporter. I'm not sure how old it is but I believe it dates from the ban era. From my reading of past posts this lower may have non-mil spec pin diameters. The rest is all Colt as well. This carbine just runs well with all ammo tried. Is there any thing else I should know about these Colt lowers? Roll markings aren't important to me.
Thanks
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