Expect nothing less than professional grade weaponry from BCM. This Bravo Company Manufacturing Barreled Upper Receiver is built around a cold hammer forged 41V50 chrome moly vanadium steel barrel. The cold hammer forging process produces the most accurate, longest lasting barrels available with a more consistent chamber and bore.The BCM MCMR Handguard eliminates external load on the barrel, reducing deflection for more accurate shooting. M-LOK mounting slots and a continuous Picatinny rail provide all the space you need for your favorite accessories.Features:16" Cold hammer forged 41V50 chrome moly vanadium steel enhanced lightweight barrel with manganese phosphate finishChambered in 5.56 NATO with 1:7 twist rate1/2x28 BCM Mod 0 CompensatorChrome lined chamber and boreHigh pressure tested and magnetic particle inspectedM4 feed rampsT-Marked Picatinny rail15" BCM MCMR M-LOK Free Float HandguardNOTE: Does not include a bolt carrier group or charging handle.