RISE Armament AR-15 6mm ARC 18in Complete Upper Receiver Rifle Length 1-7 Twist 1/2x28 Black RA-6ARC-CU-BLK-18. Specifications for RISE Armament AR-15 6mm ARC 18in Complete Upper Receiver: Manufacturer: RISE Armament Cartridge: 6mm ARC Barrel...
RISE Armament AR-15 6mm ARC 18in Complete Upper Receiver Rifle Length 1-7 Twist 1/2x28 Black RA-6ARC-CU-BLK-18. Specifications for RISE Armament AR-15 6mm ARC 18in Complete Upper Receiver: Manufacturer: RISE Armament Cartridge: 6mm ARC Barrel...