I would like to turn my Colt A2 into an A3 and I am having a hard time locating a genuine Colt A3 upper receiver...all I can find are M4 uppers....I believe the M4 upper thas the larger feed ramps as the main difference between it and the A3 upper. If I were to use an M4 upper with the A2 barrel, would it create any issues? I would much rather keep it correct but like I said I cannot find a COLT upper, and since this is a Colt rifle nothing else will do...it must be Colt. Any ideas?


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