MPN: APAR700305M51 / APAR700705M51
- Caliber: .223 Rem / 5.56 NATO
- Chamber: .223 Wylde
- Finish: Type III Class 2 Hardcoat Anodized Finish
- Upper Receiver: Aero Precision M4E1 Threaded Upper - 7075-T6 Aluminum
- Handguard: 15-Inch ATLAS S-ONE or R-ONE M-LOK Handguard of choice
- M4 Feed Ramps: Yes
- Muzzle Device: A2 Flash Hider
- Barrel: 18" 1:8 Twist 416R Stainless Steel Fluted Barrel
- Muzzle Thread Pattern: 1/2"-28 TPI
- Gas Block: Aero .750" Low-Profile Gas Block
- Gas Tube: Rifle-Length Gas Tube
- Bolt Carrier Group: Not Included
- Charging Handle: Not Included
- HP and MPI Tested
*ATLAS S-ONE Handguard: Front and rear Picatinny rail section. Eliminated center of top rail for weight reduction.
*ATLAS R-ONE Handguard: Full top Picatinny rail
- Weight: ~3.5 lbs.
- Overall Length: ~26.44"
- AR-15 lower receivers
- 1x Aero Precision 18" Fluted .223 Wylde M4E1 Complete Upper Assembly