Shop › RISE CMPLT UPPR 6MM ARC 18" BLACK RISE CMPLT UPPR 6MM ARC 18" BLACK $999.00 Rise Armament Complete Upper, 6MM ARC, 18" Stainless Steel Barrel, 1:7 Twist, 1/2x28 Threaded, Rifle Length Gas System, 15.25" Free Float M-LOK Handguard, Black Nitride Bolt Carrier Group, Ambidextrous Charging Handle, Anodized Finish, Black RA-6ARC-CU-BLK-18 Quantity: Add To Cart Added! Rise Armament Complete Upper, 6MM ARC, 18" Stainless Steel Barrel, 1:7 Twist, 1/2x28 Threaded, Rifle Length Gas System, 15.25" Free Float M-LOK Handguard, Black Nitride Bolt Carrier Group, Ambidextrous Charging Handle, Anodized Finish, Black RA-6ARC-CU-BLK-18