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colt ar-15 upper

  1. AR-15 Talk
    HI, I'm new to this forum and the AR-15 world. I would aprreciate your help in trying to figure out what Colt model my AR-15 upper came from. It has the following: A1 rear sight C H marked, triangluar handguard, bayonet lug, forward assist, No case deflector, 20" barrel, barrel twist 1/12...