Enhanced Series Upper Receivers - "Enhanced" really means enhanced.
The AR15 weapon system is an ever-evolving and modular system. That weapon system has now been enhanced by Aero Precision into the new M4E1 and M5E1 platforms. The Enhanced upper receivers are precision-machined to our specifications and features M4 feed ramps and handguard mounting platform. The rail mounting surface and barrel nut area provide a much stiffer system than a standard receiver, giving you more accuracy out of your rifle. Lightweight by design, stronger through superior engineering, the Enhanced Series delivers monolithic accuracy in a lightweight package.