Aero Precision M4E1 Threaded 6.5 Grendel Assembled Upper Receiver W/Atlas R-One 18" Barrel

Aero Precision M4E1 Threaded 6.5 Grendel Assembled Upper Receiver W/Atlas R-One 18" Barrel

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.

This complete upper includes Aero Precisions new ATLAS R-ONE Handguard! The R-ONE handguards are designed with size and weight in mind, while still providing plenty of real-estate to accommodate any attachment needs the end user may have. Aero Precisions 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 R-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. 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 R-ONE Handguard Features:

Full top picatinny rail for optional attachments
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