Aero Precision M4E1 AR-15 Upper Receiver

The Aero PrecisionA(R) M4E1 AR-15 Upper Receiver is a state-of-the-art platform and features the handguard mounting platform forged directly into the receiver for a stronger system. M4 feedramps ensure smooth, reliable feeding and .250" takedown pin holes make attaching this upper receiver to your lower receiver easy. The M4E1 upper receiver is constructed from 7075-T6 aluminum with a corrosion-resistant anodized finish and features laser engraved T-marks to make mounting your favorite optics easy. Compatible with Aero Precision Enhanced and Quantum Series handguards as well as standard AR-15/M-16 components. Also fits most BAR-system handguards. Barrel nut and wrench included and comes assembled with dust cover and forward assist installed. Supports barrels with diameter up to 1". NOT piston-kit compatible. Made in USA.