Aero Precision M4E1 Stripped Lower Receiver - Anodized Black

The Aero M4E1 Lower Receiver is a flagship product from Aero Precision. 

The M4E1 has several proprietary features, most notably it is a FORGED receiver, making it stronger than similarly styled billet receivers.  This custom-designed enhanced forging is machined from 7075-T6 Aluminum and compatible with all mil-spec AR15 parts, with a couple of features that make assembly easier.

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 Skeletonized 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 should be lightly snugged and not over torqued 
• 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