Rock River Arms A4 upper receiver in 450 Bushmaster with a forged A4 upper, a 16 inch cryogenically treated stainless barrel with a 1:24 twist and an RRA Operator muzzle brake.
- Manufacturer Part # : 450B0461
- Caliber : 450 Bushmaster
- Barrel Length : 16"
- Upper : Forged A4
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