Aero Precision M4E1 Complete Upper, 16" 5.56 Mid-Length Barrel, 15" M-LOK ATLAS S-ONE HG - FDE Cerakote

This assembled upper includes the 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. 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. Upper receiver and Handguard are FDE Cerakote.

Includes:

• M4E1 Threaded Assembled Upper Receiver
• 15" M-LOK ATLAS S-ONE Handguard
• 16" 5.56 Mid-Length Barrel
• Low Profile Gas Block and Mid-Length Gas Tube
• Product comes assembled
• The muzzle brake that comes with this upper receiver is NOT pinned nor welded to this barrel.
• This upper does not include BCG or Charging Handle.

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

16" 5.56 Mid-Length Barrel Features:

• 5.56 NATO 16" Midlength, 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