Aero Precision M4E1 5.56 NATO Assembled Upper Receiver 16" Barrel Mid-Length Black

Upgrade the performance of your AR15 build with this Aero Precision AR-15 M4E1 Upper Receiver Assembly. You will need to purchase a bolt carrier group and magazine. All other components are standard to the AR15 platform. This upper assembly does not include a BCG or Charging Handle. Features Laser engraved T-marks (Anodized only) Comes assembled, with port door and forward assist installed Accepts standard AR15/M16 components Handguard mounting platform is forged into the receiver Works with Aero Precision handguards but also fits most BAR-system handguards Built in anti-rotation tabs Scalloped rails Continuous top rail 1.78" inside diameter fits most muzzle devices and 1.5" suppressors Compatible with low profile gas blocks