Aero Precision APAR600001C M4E1 Stripped Lower | 7075-T6

The Aero Precision M4E1 APAR600001C is a stripped AR-15 lower receiver machined from 7075-T6 aluminum and finished in black. It is designed to interface with standard mil-spec AR-15 parts and adds several builder-friendly features compared with a basic forged lower. Notable functional upgrades include an integrated trigger guard, an upper tension screw for tightening fit, and a threaded bolt catch roll pin for easier installation. Typical applications include custom AR-15 builds for range use and competition shooting.

Product Specifications

• The manufacturer part number is APAR600001C.
• The UPC is 815421022315.
• The product type is a stripped lower receiver for AR-15 platforms.
• The receiver is machined from 7075-T6 aluminum.
• The listing is marked for multi-caliber compatibility.
• The finish is listed as see notes due to conflicting vendor listings.
• The receiver weight is approximately 8.61 oz.
• The package includes a nylon tipped tensioning set screw and a threaded bolt catch roll pin.
• The lower features an integrated trigger guard for added strength during assembly.
• The lower includes an upper tension screw to allow fine tuning of upper/lower fit.
• The rear takedown pin detent recess is threaded for a 4-40 set screw to ease installation.
• The magwell has an increased flare to aid in magazine insertion speed and efficiency.
• The receiver is marked and milled to accept short-throw safety selectors but will accept standard selectors as well.

Built to be the foundation of a custom AR-15, the M4E1 lower balances refined aesthetics with functional improvements that simplify assembly and use. Its material construction and feature set make it a practical choice for builders who want a robust, user-friendly starting point for range and competition-oriented platforms.