Aero Precision M4E1-T Complete Upper, 16" 5.56 Mid-Length Barrel, 15" ATLAS S-ONE MLOK HG - Kodiak Brown Anodized

The Aero Precision Complete Upper Receiver epitomizes speed, efficiency, and dependability for fashioning a semi-custom AR15 rifle. Crafted with meticulous precision, this 5.56 NATO M4E1 Threaded Complete Upper boasts a 16″ Mid-Length barrel and a 15″ ATLAS S-ONE handguard. Meticulously machined, comprehensively assembled, and subject to rigorous test-firing by skilled Aero Precision armorers, it guarantees unparalleled performance.

* Does not include Bolt Carrier Group or Charging Handle.

Includes:

• M4E1 Threaded Assembled Upper Receiver – Anodized Kodiak Brown
• 15″ M-LOK ATLAS S-ONE Handguard – Anodized Kodiak Brown
• 16″ 5.56 NATO Mid-Length Barrel
• Low-profile Gas Block and Gas Tube
• Standard A2 Flash Hider

M4E1 Threaded Upper Receiver Features:

• New enhanced forging gives the upper receiver a “billet look.”
• M4 Feed ramps
• .250 takedown pin holes
• Laser engraved T-marks
• Includes port door and forward assist installed

ATLAS S-ONE Handguard Features:

Aero Precision’s ATLAS attachment system is a secure and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards.

• 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

5.56 NATO Barrel Features:

• 5.56 NATO 1/7 twist, 4150 CrMoV, QPQ finish
• .750 gas block journal
• Mid-Length gas system
• M4 Feed Ramp Extension
• HP and MPI tested