Aero Precision 300 Blackout M4E1 ATLAS S-ONE Complete Upper
Available in black or FDE with your choice of 3 barrel lengths.
Aero Precision 300 Blackout M4E1 ATLAS S-ONE Complete Upper is the most efficient way to assemble your custom firearm, fully assembled and warrantied by Aero Precision. The S-ONE handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. Aero Precision’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.
*NFA Rules apply.
**The muzzle devices are NOT pinned nor welded to the barrel.
***Does not include Bolt Carrier Group or Charging Handle.
M4E1 Threaded Upper Receiver Features:
- New enhanced forging that 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:
- 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
300 BLK Barrel Features:
- Select between a 8″, 10″ or 16″ barrel.
- .300 Blackout 1/7 twist, 4150 CrMoV, QPQ, gas port drilled
- .750 gas block journal
- Gas Port: .0935
- Pistol length gas system.
- M4 Feed Ramp Extension
- M4 Barrel Extension
- HP and MPI tested
- Standard A2 flash hider
Choose between 3 Configurations:
APAR700301M1 / APAR700311M1 – 8″ Barrel w/ 7″ ATLAS S-ONE MLOK
APAR700302M4 / APAR700312M4 – 10″ Barrel w/ 9″ ATLAS S-ONE MLOK
APAR700305M14 / APAR700315M14 – 16″ Barrel w/ 15″ ATLAS S-ONE MLOK
- M4E1 Threaded Assembled Upper Receiver
- M-LOK ATLAS S-ONE Handguard
- 8″, 10″, or 16″ CMV Barrel
- Low Profile Gas Block and Gas Tube
- Product comes assembled
- This complete upper does not include BCG or Charging Handle.
- The muzzle brake with this complete upper receiver is NOT pinned nor welded to this barrel.
4150 Chrome Moly Vanadium, 6061-T6 Aluminum, 7075-T6 Aluminum
Black Anodize, Magpul FDE Cerakote
8", 10", 16"
|Gas Block Diameter||
Standard AR15 components
|Made in USA||
Arm or Ally is a stocking dealer for all Aero Precision, Faxon Firearms, Ballistic Advantage, HOLOSUN, Toolcraft, Elftmann Tactical, Timney, TriggerTech, HIPERFIRE and named the #1 Overall E-Commerce Dealer for Aero Precision Products in 2020!