Aero Precision M4E1 Enhanced Upper | 5.56 NATO | APAR600201AC

The Aero Precision M4E1 Enhanced upper receiver is a semi-complete assembled AR-15 upper built around a one-piece design that integrates the upper with the handguard mounting platform. It is machined from 7075-T6 aluminum and features M4 feedramps and .250″ takedown pin holes. The upper ships with a barrel nut and wrench, port door, and forward assist, and is intended for use with direct-impingement systems (not piston kits).

Product Specifications

• The caliber is .223 REM / 5.56 NATO.
• The receiver is machined from 7075-T6 aluminum for strength and durability.
• The handguard is a free-floating design for improved barrel harmonics and accessory mounting.
• The handguard finish is Black Hard Coat Anodized.
• The overall finish is black anodized.
• The unit is supplied as a semi-complete, assembled upper receiver.
• The upper includes M4 feedramps and .250 inch takedown pin holes.
• This upper supports barrels with a diameter up to 1 inch.
• Included accessories are a barrel nut and wrench, port door, and forward assist.
• The sighting configuration is listed as None, Optic Ready.
• The product is not compatible with piston kits.
• The product requires a charging handle, barrel, handguard, gas block, muzzle device, gas tube, and bolt carrier group (BCG) to be complete and functional.
• The make/model is listed as AR-15.
• The UPC is 815421022339.

Purpose-built for builders who want a durable, integrated upper/handguard platform, the M4E1 Enhanced is well suited to precision-oriented AR-15 builds and range-focused recreational shooting where a free-floating handguard and solid receiver foundation matter. Its semi-complete configuration lets you select the specific barrel, gas system, and bolt carrier components that match your intended use and preferences.