Aero Precision M4E1 5.56 Nato Lower Receiver Anodized Black APAR600112

The Aero Precision AERO AR15 M4E1 COMPLETE LOWER BK is a ready-to-install complete lower receiver built on the M4E1 series platform, offering an anodized black M4E1 stripped lower paired with a classic A2 grip, a mil-spec lower parts kit, AR15 carbine receiver extension, and carbine buffer with spring to give your AR-15 project immediate function and reliability. If you're assembling a duty rifle for training, a range carbine for practice, or a lightweight 5.56 NATO semi-automatic build for competition, this complete lower provides the core components that mate to a broad ecosystem of mil-spec upper receivers, barrels, and furniture while maintaining the M4E1's improved rail-to-receiver interface and robust magazine well geometry. The M4E1 model is designed for builders who want precise fitment, straightforward installation, and long-term durability—anodized finish resists wear and the included parts kit simplifies setup for right-hand shooters. Note that this component is a regulated lower receiver and requires FFL transfer; its specifications and AR-15 platform compatibility make it an excellent foundation for custom builds, armory maintenance, or upgrading an existing carbine into a cohesive M4E1-series rifle.