How can I tell if my ar 15 is original ? My lower is marked Colt H bar sporter . Im not sure the upper is original to the lower. The color and finish matches but I noticed that on the barrel in front of the front sight it is marked B MP 1in 9 twist instead of C MP 1 in 7 twist that I normally see on Colts. There is a CM marking on the upper rt side of the carry handle. Also the barrel is thinner where it runs under the hand guards. I thought H Bar barrels were supposed to be thick all the way through. Any help with this? Thanks in advance
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