Now that I have a spare 20" A1 profile barrel, I'm trying to decide what kind of build I want. I'm not sure I want to do another M16A1 build since I have one already, so I'm looking at doing some other retro type build. The problem is I can't think of what other guns used a 20" A1 barrel other than the Colt 711. Does anybody know what other rifles used this barrel?
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