APPG700225P52 - M4E1 Threaded 18" 6.5 Grendel Complete Upper Receiver w/ ATLAS S-ONE Handguard
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Aero Precision M4E1 Threaded 18" 6.5 Grendel ATLAS Upper

Price: $609.99
SALE PRICE: $497.24
  • Item #: APPG700225P52
  • Manufacturer: Aero Precision
Availability: Not Available

Upgrade the performance of your AR15 build with this 6.5 Grendel Complete Upper Receiver. Designed to be a low recoil/high accuracy cartridge, the 6.5 Grendel is ideal for those looking to stretch the legs of their AR15 rifle, with proven results at 1000+ yards.

The 6.5 Grendel is designed on the AR15 platform.


  • M4E1 Threaded Assembled Upper Receiver
  • ATLAS S-ONE Handguard of choice
  • 6.5 Grendel 18" Stainless Steel, Rifle Length Barrel
  • .750 Low Profile Gas Block and Rifle Length Gas Tube
  • A2-style Flash Hider
  • Product comes assembled
  • The 6.5 Grendel is designed on the AR15 platform. You will need to purchase a 6.5 Grendel specific bolt and magazine (you can find 6.5 Grendel bolts and bolt carrier groups on our website). All other components are standard to the AR15 platform. This upper assembly does not include a BCG or Charging Handle.

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

6.5 Grendel 18" Stainless Steel, Rifle Length Barrel Features:

  • 6.5 Grendel 18" Rifle Length Barrel
  • 416R Stainless Steel finish
  • 1/8 twist
  • 5/8x24 Threaded Pitch
  • SPR Profile
  • .750 gas block journal
  • Rifle length gas system
  • M4 Feed Ramp Extension
  • HP and MPI tested
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