Mean Arms Bearing Delay AR-15 9mm 16in/14.5in Upper Receiver 1/2x28 Black

Mean Arms Bearing Delay AR-15 9mm 16in/14.5in Upper Receiver 1/2x28 Black. The ball bearings interface with corresponding features in the barrel extension and provide the lockup in battery and the delay after firing. The system can be tuned by replacing the Lifter to change the angle of the surfaces that push the bearings from the inside of the BCG. The bolt face includes our unique center ejector to provide the most consistent ejection of any 9mm AR on the market. The firing pin passes through