Aero Precision M4E1 AR15 Lower Receiver (Anodized Black) - Enhanced Forged 7075-T6
The Aero Precision M4E1 lower receiver is an enhanced forging that delivers a billet-style profile while maintaining compatibility with standard AR15 components and magazines. Key design features include an integrated trigger guard, a flared magwell, and a threaded bolt catch pin system to simplify assembly.
This lower is marked "Cal Multi" and is milled/marked to accept short-throw safety selectors while still working with standard selectors. This unit is configured with a receiver extension (buffer tube) and pistol grip installed.