M4E1 Threaded 14.5" 5.56 Carbine Length Complete Upper Receiver w/ ATLAS S-ONE Handguard

This complete upper includes our 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. 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. Includes: M4E1 Threaded Assembled Upper Receiver ATLAS S-ONE Handguard of choice 14.5" 5.56 M4 CMV Barrel, Carbine Length Low Profile Gas Block and Carbine Length Gas Tube 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 The muzzle brake that comes with this complete upper receiver is NOT pinned nor welded to this barrel. Per the National Firearms Act, the muzzle brake MUST be pinned and welded to achieve the necessary 16" as defined by the ATF for a rifle build. 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 1.3AA�A� Inside diameter 1.5AA�A� Outside diameter Compatible with mil-spec AR15 upper receivers and barrels Learn More about our NEW ATLAS S-ONE Hanguards 14.5" 5.56 M4 CMV Barrel, Carbine Length Features: Chamber: 5.56 Length: 14.5" Twist: 1 in 7 Threading: 1/2"x28 Material: Chrome Moly Vanadium Finish: QPQ corrosion resistant finish both inside and out Gas Block: .750 Gas Port: .0785 Gas System Length: Carbine Weight: 25.28 oz M4 Barrel Extension HP and MPI Tested