Noveske Rifleworks Upper 300 Blackout NV-U-16-300BLK-N -

6” Barrel available in Stainless Steel or Cold Hammer Forged--TWIST-1 in 7" Twist polygonal rifling (Stainless5.56mm)-1 in 7” Twist (Stainless 300BLK)-1 in 7” Twist, M249 Machine Gun barrel steel and Chrome Lining (appx. 2 times as thick as an M4 or M16) (Cold Hammer Forged5.56mm/300BLK)--FINISH-Beadblasted finish (Stainless)-Mil Spec Phosphate finish (Cold Hammer Forged)-- DIRECT GAS-IMPINGEMENT-5.56mm, Stainless/CHF = Mid length gas system-300BLK, Stainless = Pistol length gas system-300BLK, CHF = Carbine Length Gas System--THREAD-1/2x28 (5.56mm)-5/8x24 (300BLK)--Low-profile gas block, pinned to barrel--Extended Feed Ramp Barrel Extension/Upper--Gen III Upper Receiver, CNC-machined 7075-T6 featuring anti-rotation interface with the handguard--HANDGUARD OPTIONS-NOVESKE 13.5" QUAD Rail w/ 1913 rails-NSR-13.5free floated handguard w/ 1913 top rail--Shot peened and MP tested bolt--Auto carrier with properly staked carrier key--Raptor Ambidextrous Charging Handle--Blackout Non-Mount Flash Suppressor, 300BLK includes 51T AAC BlackoutUpper Weight:NEED