Expect nothing less than professional grade weaponry from Bravo Company USA, one of the nation’s largest stocking inventories of AR-15, M4, and M16 parts and accessories. This BCM barreled upper receiver is built for professionals with the Mil-Spec features that are required for optimum performance. The barrel is precision machined out of 11595E steel for increased barrel life and accuracy and then Manganese Phosphate finished to absorb oil and prevent corrosion. The coating is applied before the front sights to ensure every section of the barrel is protected from the elements. The 5.56 NATO chamber and bore are chrome lined making it harder than steel, which aids in chambering, extraction, and overall reliability and further increasing the life of the barrel. This barreled upper assembly features a mid-length gas system that strikes the perfect balance between low felt recoil and reliability. The M4 feed ramps utilized on the barrel extension as well as the upper receiver help to increase reliability when firing multiple rounds in rapid succession.