Aero Precision M4E1 AR-15 Receiver Set OD Green

The Aero Precision M4E1 Threaded Receiver Assembly Set includes the M4E1 Lower Receiver and the M4E1 Threaded Assembled Upper Receiver.M4E1 Lower Receiver FeaturesThreaded 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).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 ...