Rock River Arms

Rock River Arms A4 Carbine upper comes chambered in .350 Legend with a 16" chrome moly 1/16 twist barrel. Additionally this upper includes a RRA 13" M-Lok compatible lightweight free float rail and a RRA Operator Brake (1/2-36 thread). This is a complete upper with bolt carrier group, charging handle assembly and a 10 round magazine. Features : - .350 Legend - 16 Inch Chrome Moly, 1:16 Twist - RRA Operator Brake, 1/2-36 Thread - Low Profile Gas Block, CAR Length Gas System - RRA 13 Inch Extended Lightweight Free Float Rail - Bolt Carrier Group, Charging Handle Assembly - (1) Magazine, (10) Rounds