Upper Receivers & Conversion Kits

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  • Rra Cmplt Car A4 Upr 458 Socom 16

    $687.85

    Rock River Arms Tactical Carbine, Complete Upper Receiver, 458 Socom, 16″ Barrel, RRA Operator Muzzle Brake, RRA 15″ Free Float M-LOK Handguard, Anodized Finish, Black, Fits AR-15, Includes Bolt Carrier Group and Charging Handle Assembly SOC0564

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  • Rra Cmplt Mid A4 Upr 450BM 16 5RD

    $655.71

    Rock River Arms Tactical Carbine, Complete Upper Receiver, 450 Bushmaster, 16″ Barrel, Mid-Length Gas System, RRA Operator Muzzle Brake, RRA 13″ Free Float M-LOK Handguard, Anodized Finish, Black, Fits AR-15, 5 Rounds, 1 Magazine, Includes Bolt Carrier Group and Charging Handle Assembly 450B0592

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