Aero Precision

The M4E1 Lower Receiver delivers billet aesthetics in a forged package. This custom-designed enhanced forging is machined from 7075-T6 Aluminum and compatible with all mil-spec AR15 parts. Aside from the visual upgrades this custom-engineered design provides features that challenge much more expensive billet options and simplify the assembly process for the at-home builder. - M4E1 Lower Receiver Improvements: - Threaded Bolt Catch Roll Pin- Allows for simple installation of the bolt catch and virtually eliminates the chance to damage the finish during installation (pin included). 1/16 Hex Key required for assembly. - Integrated Trigger Guard- Eliminates the possibility of breaking the trigger guard tabs by integrating the trigger guard into the lower creating a stronger more rigid platform to build upon. - Upper Tension Screw- Allows users to fine tune the fit of the upper and lower receiver using a nylon tipped tensioning set screw inserted in the grip tang of the lower receiver. This provides a tight fit with any standard AR15 upper receiver. - Threaded Takedown Pin Detent Recess- Allows user to easily install the Takedown Pin detent and spring with the use of a 4-40 set screw (no more launching detents across the room). - Increased Magwell Flare- Increased the flare of the magwell to aid in quick and efficient magazine changes. - Marked and milled to accept short-throw safety selectors but will work with standard selectors as well. - Includes: - Stripped M4E1 Lower Receiver - Nylon tipped tensioning set screw - Threaded Bolt Catch Pin