The Aero Precision M4E1 AR-15 Lower Receiver, machined from durable 7075-T6 aluminum and anodized black, blends billet aesthetics with a forged lower. The M4E1 Lower Receiver introduces key improvements for simplified assembly and enhanced durability. This stripped lower features a threaded bolt catch roll pin for easy installation, an integrated trigger guard, and a subtle Aero 'A' Logo.  An upper tension screw allows for fine-tuning the fit of the upper and lower receiver, enhancing stability. An increased magwell flare facilitates quick and efficient magazine changes.

Features:

• 7075-T6 forged aluminum construction
• Anodized black finish
• Weight: 8.61 oz
• Subtle Aero 'A' Logo
• Compatible with all mil-spec AR15 parts
• Threaded bolt catch roll pin
• Integrated trigger guard
• Upper tension screw for fit adjustment
• Threaded takedown pin detent recess
• Increased magwell flare
• Marked and milled for short-throw safety selectors