The Aero Precision M4E1-T complete upper (brand part number APAR700704M99) is built around a 13.9-inch 5.56 NATO mid-length CMV barrel with a 1:7 twist and QPQ finish, paired with the company’s 12.7-inch ATLAS R-ONE M-LOK handguard. It is built on a forged M4E1 threaded upper receiver and includes a low-profile gas block, a mid-length gas system and a standard A2 flash hider, with the forward assist and dust cover already installed. It ships fully assembled but without a bolt carrier group or charging handle. It is a fast way to a compact mid-length build.

Key Specifications

• Chambering is 5.56 NATO.
• Barrel length is 13.9 inches.
• Twist rate is 1:7, with a 4150 CrMoV barrel and QPQ finish.
• The gas system is mid-length with a low-profile gas block.
• The handguard is the 12.7-inch ATLAS R-ONE M-LOK free-float design.
• The upper receiver is forged 7075-T6 aluminum.
• The muzzle device is a standard A2 flash hider.
• It ships without a bolt carrier group or charging handle.

Frequently Asked Questions

Is this a complete firearm? No. It is a complete upper assembly with no lower receiver included, and it ships without a bolt carrier group or charging handle.

What muzzle device comes installed? A standard A2 flash hider.

What handguard does it use? The 12.7-inch ATLAS R-ONE M-LOK free-float handguard.

Buy the Aero Precision M4E1-T Complete Upper, 13.9-Inch 5.56 Mid-Length with ATLAS R-ONE Handguard

Start a compact mid-length build from an assembled Aero Precision upper. Browse more AR15 uppers and order from our Lubbock, Texas gun shop for direct shipping.