Aero Precision APAR308554M44: This Complete Upper includes Aero Precision\'s Gen 2 Enhanced M-LOK Handguard! Key features include the addition of quick disconnect sling sockets, enhanced milling design for grip and visual appeal and a new profile for the picatinny top rail. This complete upper does not include a BCG or Charging Handle. Includes: M5E1 Assembled Upper Receiver Gen 2 Enhanced 15\" M-LOK Handguard 18\" 6.5 Creedmoor Stainless Steel Barrel Low Profile Gas Block and Mid Length Gas Tube Product comes assembled M5E1 Upper Features: Forged from 7075 T6 aluminum Precision machined to our specs M4 feedramps Laser engraved T-marks .2795" takedown pin holes Accepts standard AR .308 components Comes with forward assist and port door installed Handguard mounting platform is forged into the receiver NEW Gen 2 Enhanced Handguard Features: Added quick disconnect sling socket at the 3, 6 and 9 o\'clock positions Milled additional surfaces along flats to aid with gripping and add visual appeal New profile of the Picatinny Top Rail 1pc free float design Rail is Machined from 6061-T6 Aluminum Built in Anti-Rotation tabs Scalloped rails Continuous top rail 1.78\" inside diameter fits most muzzle devices and 1.5\" suppressors Compatible with low profile gas blocks 18\" 6.5 Creedmoor Stainless Steel Barrel Features: Twist: 1 in 8 Threading: 5/8 x 24 Material: 416R Stainless Steel Finish: Bead Blasted Gas Block Journal: .875 Gas System Length: Mid-Length Weight: 61.5 oz DPMS Barrel Extension HP and MPI Tested