Aero Precision M4E1 Forged Stripped Ar-15 Lower Multi-Caliber Hardcoat Anodized

The Aero Precision M4E1 Forged Stripped AR15 Lower Receiver in anodized black brings the M4E1 series design to builders who demand a durable, feature-rich foundation for an AR-15 build, machined from 7075-T6 forged aluminum and marked "Cal Multi" with an M4- serial designation for multi-caliber compatibility. This stripped lower includes an included nylon-tipped tensioning set screw and a threaded bolt catch roll pin that allows simple bolt catch installation while protecting the finish, and the integrated trigger guard removes fragile tabs for a stiffer, more durable platform suited to hard-use range rifles, hunting rigs, or duty-style builds. The upper tension screw lets you fine-tune receiver fit with a 1/16" hex key, the rear takedown pin detent recess is threaded for a 4-40 set screw to prevent launching detents, and the increased magwell flare helps speed reloads under stress. Marked and milled to accept short-throw safety selectors while remaining compatible with standard AR15 components and magazines, this Made-in-America receiver weighs 8.61 oz and ships to an FFL dealer as required, making it a practical choice for custom builders and armory upgrades.