Aero Precision M4E1 PRO Stripped Lower Receiver – 5.56/.223 (Black)

The Aero Precision M4E1 PRO Stripped Lower Receiver is engineered for builders who demand superior strength, precision machining, and streamlined assembly. Featuring Aero’s enhanced M4E1 PRO forging, integrated trigger guard, flared magwell, and threaded bolt catch pin, this lower provides the perfect foundation for a professional-grade 5.56/.223 AR build.

FEATURES

• Caliber Compatibility: 5.56 NATO / .223 Remington
• Platform: AR-15 / M4
• Material: 7075-T6 forged aluminum (M4E1 PRO enhanced forging)
• Finish: MIL-SPEC Type III Class 2 hardcoat anodized – Black
• Design: Integrated trigger guard & enhanced receiver geometry
• Flared magwell for smoother reloads
• Threaded bolt catch pin for easy assembly
• Rear takedown detent spring channel for simplified installation
• Selector Markings: Safe / Fire
• Compatible with all MIL-SPEC AR-15 upper receivers
• Made in the USA

COMPATIBILITY & FITMENT

Designed to accept standard MIL-SPEC AR-15 components (LPKs, buffer tubes, stocks, grips, barrels, BCGs). For AR pistol or SBR configurations, consult a qualified gunsmith and ensure full compliance with NFA regulations and all federal, state, and local laws.

IMPORTANT NOTES

• FFL Required: Ships only to a valid Federal Firearms License holder.
• All order communication will be sent through sales@rra2a.com.
• Customer is responsible for ensuring legality of ownership in their jurisdiction.