As prior military services I'm able to inform you the real discrepancies involving the AR15 plus the M4 is: The AR15 (M16)A1 and A2 Possess a 20” barrel, iron sights with a have take care of and glued buttstock. The A3 is the same by using a 16” barrel and it has a carry tackle or pictinny top rail and a hard and fast buttstock. The A4 aka AR4

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