Aero Precision M4E1 16″ 5.56 Complete Upper Receiver w/ ATLAS S-ONE Handguard

This complete upper includes Aero’s new ATLAS S-ONE Handguard. The S-ONE line of handguards is designed with size and weight in mind, providing the perfect addition to your lightweight build. Aero’s 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
• 15″ ATLAS S-ONE Handguard.
• 16″ 5.56 CMV Barrel.
• Low Profile Gas Block and Mid-Length Gas Tube.
• Port Door Assembly.
• A2 Flash Hider.

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.
• 1.3″ Inside diameter.
• 1.5″ Outside diameter.
• Compatible with mil-spec AR15 upper receivers and barrels.
• MLOK attachment points.

16″ 5.56 Barrel Features:

• 5.56 NATO 16″ Barrel, 1/7 twist, 4150 CrMoV, QPQ, gas port drilled.
• .750 gas block journal.
• Mid-length gas system, .0785 gas port.
• M4 Feed Ramp Extension.
• HP and MPI tested.
• Standard A2 flash hider.

Note:

This complete upper receiver does not include BCG or Charging Handle.