Aero Precision APAR538105M71: This complete upper includes Aero Precision\'s 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. This complete upper does not include BCG or Charging Handle. Includes: M5 (.308) Threaded Assembled Upper Receiver 15\" M-LOK ATLAS S-ONE Handguard 24\" 6.5 Creedmoor Fluted Stainless Steel Barrel, Rifle Length Low Profile Gas Block and Rifle Length Gas Tube .308 A2 Birdcage Flash Hider Product comes assembled 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) Includes port door and forward assist ATLAS S-ONE Handguard Features: Front and rear picatinny rail Eliminated center of top rail for weight reduction Indexing grooves in 12:00 position for positive grip control Quick disconnect sling socket at the 3, 6 and 9 o\'clock positions Compatible with low profile gas blocks