Aero Precision M4E1 AR15 Multi-Cal Black Receiver

Aero Precision M4E1 Receiver — 7075-T6 Aluminum AR-15 Lower (Multi-Caliber, Mil-Spec)

The Aero Precision M4E1 Receiver is a premium, multi-caliber AR-15 lower machined from forged 7075-T6 aluminum and finished in durable black anodize. Engineered to mil-spec dimensions for seamless compatibility with standard AR-15 parts, the M4E1 blends billet aesthetics with forged strength and user-focused features—making it the ideal foundation for precision builds, duty rifles, and custom projects.

Key Features

• Machined from forged 7075-T6 aluminum for exceptional strength-to-weight and long-term durability
• Black anodized finish for corrosion resistance and low-glare tactical appearance
• Mil-spec dimensions ensure compatibility with standard AR-15 lower parts kits and accessories
• Integrated trigger guard for increased rigidity and snag-free operation with gloves
• Increased magwell flare speeds reloads and improves magazine insertion reliability
• Threaded bolt catch pin included for easier assembly and stronger installation
• Rear takedown pin detent recess threaded for a 4-40 set screw streamlines detent installation
• Nylon-tipped upper tensioning set screw for adjustable upper/lower fitment and reduced play
• Billet-style aesthetics in a forged package — premium looks without sacrificing forged strength
• Stripped lower design lets you choose your preferred lower parts kit, buffer, and stock

Specifications

• Brand: Aero Precision
• Model: M4E1 Receiver (Stripped Lower)
• Category: Lowers / AR-15 Receivers
• Firearm Fit: AR-15 (Multi-Caliber compatible)
• Material: 7075-T6 Forged Aluminum (machined)
• Finish: Black Anodized
• Includes: Threaded bolt catch pin; nylon-tipped tensioning set screw
• Compatibility: Mil-spec AR-15 lower parts kits, buffer tubes, and stocks
• Trigger: None (stripped)
• Weight: 8.61 oz (stripped)
• Notes: Rear takedown pin detent recess threaded for 4-40 set screw; increased magwell flare

Aero Precision’s M4E1 Receiver gives builders a rock-solid, mil-spec foundation with smart assembly features and premium materials. Whether you’re assembling a duty rifle, competition build, or a versatile multi-caliber AR-15, this M4E1 lower reduces build time and improves long-term durability while delivering the fit and finish serious shooters expect.