Aero Precision Lowers Comparision – M4E1 vs AR15 Gen2

November 6, 2023

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The M4E1 Lower has a threaded bolt catch, forward assist, rear takedown pin, upper/lower adjustment screw and an integrated handguard. Basically makes your life considerably easier as far as installation goes. Below is a break down of what features each one has.

Aero Precision M4E1 Details

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

Aero Precision AR15 Gen 2

GEN 2 IMPROVEMENTS

Upper Tension Screw – Allows users to fine tune the fit of the upper and lower receiver through the use of 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.
Increased Magwell Flare – Allows for easier insertion of magazines and provides a sleeker look.