M4E1 Threaded 20" .223 Wylde Fluted Complete Upper Receiver w/ ATLAS S-ONE Handguard

This complete upper includes our 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. Our 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
• ATLAS S-ONE Handguard of choice
• 20" .223 Wylde Fluted Rifle Length Stainless Steel Barrel
• Low Profile Gas Block and Rifle Length Gas Tube
• Product comes assembled
• This complete upper does not include BCG or Charging Handle. These products may be selected as add-ons under the FINISH YOUR BUILD tab

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
• Learn More about our NEW ATLAS S-ONE Hanguards

20" .223 Fluted Stainless Steel Rifle Length Barrel Features:

• .223 Wylde 20" Rifle Length Barrel, 1/8 Twist
• 416R Stainless Steel
• Bead Blasted Finish
• .750 gas block journal
• Rifle length gas system
• M4 Feed Ramp Extension
• HP and MPI tested
• Standard A2 flash hider
• ALL NEW Fluted Design
• Barrel Weight: 34 oz