Rock River Arms A4 mid-length upper comes chambered in .450 Bushmaster with a 16″ chrome moly 1/24 twist barrel. Additionally this upper includes a RRA 13″ M-Lok compatible lightweight free float rail and a RRA Operator Brake (5/8-32 thread). This is a complete upper with bolt carrier group, charging handle assembly and a 5 round magazine.
AMERICAN DEFENSE MFG-AR15 MLOK RAIL W/ BARREL NUT-15IN-BLACK
Original price was: $250.00.$220.00Current price is: $220.00.
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