Aero Precision M4E1 Stripped Lower Receiver Flat Dark Earth 5.56 / .223 Rem

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 ReceiverNylon tipped tensioning set screwThreaded Bolt Catch Pin 1 Milled & Marked For standard and short throw safety selectors 2 Threaded Bolt Catch Eliminates the chance to mar your receivers finish when installing your bolt catch 3 Flared Magwell Aids in quick and efficient magazine changes 4 Integrated Trigger Guard Streamlining the assembly process and providing a more rugged platform 5 Upper Tension Set Screw Allows users to fine tune the fit between upper and lower receivers 6 Threaded Takedown Pin Detent Channel Eases receiver extension installation by capturing the spring detent with a 4-40 set screw