Aero Precision M4E1 Stripped Lower Receiver, Flat Dark Earth

Aero Precision M4E1 Lower Receiver

The M4E1 represents a thoughtful evolution in AR-15 lower receiver design. Machined from 7075-T6 forged aluminum, it delivers the refined aesthetics of a billet receiver while maintaining the durability and cost-effectiveness of a quality forging.

Key Features

Integrated Trigger Guard — The trigger guard is machined as part of the lower receiver itself, eliminating the weak points that plague pinned designs. This creates a stronger, more rigid platform from the start.

Upper Tension Screw — A nylon-tipped set screw in the grip tang allows you to fine-tune the fit between upper and lower receiver. This simple adjustment ensures a tight, rattle-free connection with any standard AR-15 upper.

Enhanced Magwell — The increased flare at the magwell opening speeds up magazine changes under pressure and reduces fumbling during transitions.

Threaded Bolt Catch Pin — Installation is straightforward with the included threaded pin. No more risk of marring the finish or struggling with traditional roll pin installation.

Threaded Takedown Pin Detent Recess — A 4-40 set screw secures the takedown pin detent spring, eliminating the frustration of launching tiny springs across your workspace.

Specifications

• Platform: AR-15
• Material: 7075-T6 forged aluminum
• Finish: Magpul Flat Dark Earth Cerakote
• Markings: "Cal Multi" and "M4-" designation with serial number
• Weight: 8.61 oz
• Compatibility: All mil-spec AR-15 components and magazines
• Safety Selector: Marked and milled for short-throw selectors; works with standard selectors

What You Need to Complete Your Build

This is a stripped lower receiver. You will need to source a lower parts kit, buffer tube assembly, and stock to complete a functional rifle. The M4E1 accepts all standard AR-15 components, giving you complete flexibility in your build.