This complete upper includes our 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. Our 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. Features: M5 Assembled Upper Receiver Features: Forged from 7075 T6 aluminum M4 Feedramps .2795 takedown pin holes Laser engraved T-marks DPMS High Profile (.210) Tang)