Aero Precision

Overview

The Aero Precision M4E1 Threaded Barreled AR-15 Upper Receiver in .300 Blackout is a complete assembly designed specifically for pistol builds. With a 10-inch barrel length and a 1:7 twist rate, it effectively stabilizes heavier projectiles, making it ideal for a variety of ammunition types. The pistol-length gas system ensures reliable cycling in compact configurations, while the 5/8x24 thread pitch allows for compatibility with a range of muzzle devices. This upper is commonly found in builds focused on .300 Blackout, particularly those emphasizing maneuverability and versatility.