MEAN ARMS Bearing Delay 9mm Luger Complete Upper Receiver

Bearing Delay 9mm Luger Complete Upper Receiver by Mean Arms. The complete upper is available in 5 barrel lengths: 4.5, 7.5, 11, 14.5, and 16 inches, all threaded for a 1/2-28 muzzle device. No 9mm-specific buffer is needed; designed to work with standard AR-15 buffers. The heart of the Bearing Delay Upper Receiver is the ball bearing bolt carrier group (BCG). The ball bearings interface with corresponding features in the barrel extension and provide the lockup in battery and the delay after firing. The Lifters can be swapped to tune the bearing geometry. The bolt face includes a center ejector to provide consistent ejection. Each Bearing Delay Upper Receiver includes two Lifters. Also included are two Endomags. The upper receiver is a slick side billet machined aluminum upper with MA Handguard and charging handle. The muzzle device reduces recoil and muzzle flash. Includes two ejectorless Endomags.