M4E1 Threaded Complete Upper, 16" 5.56 HBAR Mid-Length Barrel w/ 15" ATLAS S-ONE M-LOK Handguard - FDE Cerakote

This complete upper receiver incudes an HBAR profile barrel that is laser marked "HBAR". Includes: M4E1 Threaded Assembled Upper Receiver 15" ATLAS S-ONE M-LOK Handguard 16" 5.56 HBAR Barrel Low Profile Gas Block and Mid-Length Gas Tube AR15 A2 Birdcage Flash Hider Product comes assembled This complete upper does not include BCG or Charging Handle. These products may be selected as add-ons under the Finish Your Build tab M4E1 Threaded Upper Receiver Features: New enhanced forging that gives the upper receiver a "billet look" New picatinny profile that blends seamlessly with our Enhanced Series Handguards M4 Feedramps .250 takedown pin holes Laser engraved T-marks Includes port door and forward assist installed 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 1.3