Brownells 75th Anniversary - A Shooting Heritage
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This complete 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.

  • 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 complete upper does not include BCG or Charging Handle.
  • The muzzle brake that comes with this complete 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 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
  • 1.3” 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

AERO PRECISION - M4E1 UPPER RECEIVERS COMPLETE .300 BLACKOUT

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Cartridge: 300 AAC Blackout

Finish: Black

Style: Complete

Contour: CMV

Length: 10"

Twist: 1-7

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Cartridge: 300 AAC Blackout

Finish: Black

Style: Complete

Contour: CMV

Length: 8"

Twist: 1-7

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Cartridge: 300 AAC Blackout

Finish: Black

Style: Complete

Contour: CMV

Length: 16"

Twist: 1-7