Quote:
Originally Posted by greasy_old_tanker
What is the difference between a M16A3 and M16A4? cosmetic really. The M16A4 has the picatinny rail system in place of the forward handguards.
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The M16A3 (M16A2E3) is identical to the M16A2, with the exception of a S-1-F instead of S-1-3 trigger group. The M16A4 (M16A2E4) replaces the fixed carry handle upper receiver of the A2/A3 with a "flat top" rail equipped receiver. Also, while the KAC M5 RAS may or may not be standard issue for various units, the M16A4 is not standard with it and not all A4s I've seen in pictures have had it. For a while after its introduction, M16A4s fitted with the RAS were referred to as "M16A4 Modular Weapon System" or M16A4 MWS.