MPN: APAR700325M53 / APAR700725M53


  • Caliber: 6.5 Grendel
  • Finish: Type III Class 2 Hardcoat Anodized Finish
  • Upper Receiver: Aero Precision M4E1 Threaded Upper - 7075-T6 Aluminum
  • Handguard: ATLAS S-ONE or R-ONE Handguard of choice
  • M4 Feed Ramps: Yes
  • Muzzle Device: A2 Flash Hider
  • Barrel: 20" 1:8 Twist 416R Stainless Steel Barrel
  • Muzzle Thread Pattern: 5/8"-24 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
  • DMR Profile

*This upper assembly does not come with Bolt Carrier Group and Charging Handle

*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: ~4.4 lbs.
  • Length: ~28.4"


  • AR-15 lower receivers


  • 1x Aero Precision 20" 6.5 Grendel M4E1 Complete Upper Assembly


The Aero Precision 20 inch 6.5 Grendel M4E1 complete upper assembly increases the performance of your AR-15 platform with proven results out to 1,000 yards. The upper assembly is designed with both weight and performance in mind, and the handguard provides plenty of room to accommodate any accessories you wish.

Top Choice

This 20-inch 6.5 Grendel complete upper comes with Aero's proprietary ATLAS attachment. This creates a strong and durable mounting platform with a slim profile that adds to your platform's dependability and maneuverability.

Superior Craftsmanship

The Aero Precision 20-inch upper assembly enhanced forging provides for a "billet" look, and the Picatinny profile blends seamlessly with the handguard for increased handling and aesthetically pleasing lines. The upper is made from 7075-T6 aluminum, weighing at just 4.4 pounds, and sports a type III hardcoat anodized finish. The 20-inch barrel is crafted from 416R stainless steel and is equipped with an A2 Flash Hider and an M4 feed-ramp extension to ensure smooth ammo cycling. The handguard has a top Picatinny rail with a quick-disconnect sling socket that adjusts to the three-, six- and nine-o'clock positions.

No-Hassle Installation

The 20-inch 6.5 Grendel complete upper assembly is compatible with low-profile gas blocks and installs easily with no special gunsmithing knowledge. Note that the assembly does not come with a bolt carrier group and charging handle.

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  • This Item: Aero Precision 20" 6.5 Grendel M4E1 Complete Upper Assembly
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    MSRP: $765.00
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