The Aero Precision M4E1 Stripped Lower Receiver (part no. APAR600001C) delivers billet-style aesthetics from a forged package, machined from 7075-T6 aluminum and compatible with all mil-spec AR-15 parts. Aero Precision packs in a handful of build-friendly upgrades over a standard forging: an integral trigger guard that eliminates the risk of broken trigger guard tabs, a threaded bolt catch roll pin for simple installation, and a nylon-tipped upper tension screw for a tighter fit with any standard AR-15 upper. This M4E1 lower is multi-caliber compatible and ships stripped, ready for your choice of lower parts kit, buffer, and stock.

Key Specifications

• Machined from 7075-T6 aluminum in a custom-engineered forging.
• Features an integral trigger guard for added strength over separate guard tabs.
• Includes a threaded bolt catch roll pin for simple, damage-free installation.
• Fitted with a nylon-tipped upper tension screw for a tighter upper/lower fit.
• Features a threaded takedown pin detent recess for easier assembly.
• Machined with an increased magwell flare for quicker magazine changes.
• Milled to accept short-throw safety selectors as well as standard selectors.
• Measures 8.95 inches in overall length.
• Multi-caliber compatible with standard AR-15 pattern uppers.
• Ships as a stripped receiver, ready for your lower parts kit and stock.

Frequently Asked Questions

Does it work with short-throw safety selectors? Yes, it is milled to accept short-throw selectors while still working with standard selectors.

What makes the trigger guard different? It is integral to the receiver, eliminating the risk of breaking separate trigger guard tabs.

Does this lower ship with a parts kit? No, it ships stripped and requires a lower parts kit, buffer, and stock to complete.

Buy the Aero Precision M4E1 Stripped Lower Receiver

Build on a feature-rich Aero Precision receiver. Browse more AR-15 lower receivers and order from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.