This assembled upper includes Aero Precision’s 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. Their 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:

• M4E1 Threaded Assembled Upper Receiver
• 7"" M-LOK ATLAS S-ONE Handguard with 7” .300 Blackout CMV Barrel OR
• 9"" M-LOK ATLAS S-ONE Handguard with 10"" .300 Blackout CMV Barrel OR
• 12"" M-LOK ATLAS S-ONE Handguard with 16"" .300 Blackout CMV Barrel
• Low Profile Gas Block and Pistol Length Gas Tube in all makeups.
• This assembled upper does not include BCG or Charging Handle.
• The muzzle brake that comes with this assembled upper receiver is NOT pinned nor welded to this barrel.

M4E1 Threaded Upper Receiver Features:

• New enhanced forging that gives the upper receiver a ""billet look""
• New picatinny profile that blends seamlessly with Aero's 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” Inside diameter
• 1.5” Outside diameter
• Compatible with mil-spec AR15 upper receivers and barrels

8" .300 Blackout Barrel Features:

• Length: 8""
• Twist: 1 in 7
• Muzzle: 5/8x24 Threaded
• Material: 4150 Crome Moly Vanadium
• Finish: QPQ corrosion resistant finish both inside and out
• Gas Block: .750
• Gas Port: .109
• Gas System Length: Pistol
• Weight: 18 oz
• M4 Barrel Extension
• HP and MPI Tested

10" .300 Blackout Barrel Features:

• Length: 10""
• Twist: 1 in 7
• Muzzle: 5/8x24 Threaded
• Material: 4150 Crome Moly Vanadium
• Finish: QPQ corrosion resistant finish both inside and out
• Gas Block: .750
• Gas Port: .0935
• Gas System Length: Pistol
• Weight: 21
• M4 Barrel Extension
• HP and MPI Tested

16” .300 Blackout Barrel Features:

• Chamber: .300 Blackout
• Length: 16""
• Material: 4150 Chome Moly Vanadium
• Finish: QPQ Corrosion Resistant Finish
• Gas System Length: Pistol
• Gas Block Journal: .750""
• Twist Rate: 1:7 Inches
• Muzzle: 5/8x24 Threaded
• Weight: 29 oz
• M4 Feed Ramp Extension, HP and MPI Tested, Standard A2 Flash Hider