Ar-15 M4e1 16'''' Upper Build Kit 5.56mm - Ar-15 M4e1 16 Upper Build Kit 5.56mm

This complete upper includes Aero Precision's new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. Aero Precision's proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards. M4E1 Threaded Assembled Upper Receiver comes with a 16" 5.56 Mid CMV Barrel. The upper also features a low profile gas black, M4 feed ramps, .250 takedown pin holes, laser engraved T-Marks, and includes port door as well as an installe Mfg: Brownells