Aero Precision AR-15 M4E1 Upper Receiver Assembly 6.5 Grendel 20″ Barrel ATLAS S-ONE M-LOK Handguard without Bolt Carrier Group or Charging Handle

Upgrade the performance of your AR15 build with this Aero Precision AR-15 M4E1 Upper Receiver Assembly. 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. You will need to purchase a 6.5 Grendel specific bolt carrier group and magazine. All other components are standard to the AR15 platform. This upper assembly does not include a BCG or Charging Handle.

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Includes:

• M4E1 Threaded Assembled Upper Receiver
• ATLAS S-ONE Handguard of choice
• 6.5 Grendel 20″ Stainless Steel, Rifle Length Barrel
• .750 Low Profile Gas Block and Rifle Length Gas Tube
• A2-style Flash Hider

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Features

• Enhanced forging that gives the upper receiver a “billet look”
• Picatinny profile that blends seamlessly with Enhanced Series Handguards
• .250 takedown pin holes
• Laser engraved T-marks
• Includes port door and forward assist installed
• 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
• HP and MPI tested barrel