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Questions & Answers
Who makes the barrel? Expert Answer

The Aero Precision M4E1 Threaded 20in 6.5 Grendel Complete Upper Receiver includes the Aero Precisions 20" 416R stainless steel 6.5 Grendel barrel. It features a 1:8 twist, .750" gas journal, rifle length gas system, button rifling, and 5/8x24 threads.

by Ethan, Gear Expert, July 28, 2022
Customer Reviews
Helpful Positive Review
The product is quality. Great, love it. The description says "Complete" upper which often means it includes the BCG and charging handle. This does not. It does say this in the description but I was in a hurry and did not read the description well. O...
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5/6 found this helpful
Most Recent Reviews
aero grendel upper by Flakes, Verified Owner, January 14, 2025
I originally ordered different upper but was bsck ordered. Cancelled.ordef and ordered this one. Im 100% glad i did this upper is well made and looks amazing on my aero lower.
Most Recent Reviews
Avid hunter by Bo Bo, Verified Owner, September 22, 2023
Everything was fine except it wasn’t complete. Had to reorder charging handle and bolt assembly. Found out doesn’t come with complete upper. It was misrepresented to the untrained purchaser. Other than that; fabulous.
Read All 3 Reviews
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Product Info for Aero Precision M4E1 Threaded 20in 6.5 Grendel Complete Upper Receiver with Flash Hider w/ATLAS S-ONE Handguard

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.image

Specifications for Aero Precision M4E1 Threaded 20in 6.5 Grendel Complete Upper Receiver with Flash Hider w/ATLAS S-ONE Handguard:

Manufacturer: Aero Precision
Caliber: 6.5mm Grendel
Overall Length: 30 in
Barrel Length: 20 in
Barrel Profile: M4
Gas System Length: Rifle Length
Barrel Twist Rate: 1-8
Threads per Inch: 5/8x24
Handguard Type: Free-Float
Muzzle Device: A2 Flash Hider
Gun Model: AR-15
Condition: New
Fabric/Material: 416R Stainless Steel
Attachment Type: Picatinny
Gas Block Journal Size-Diameter: .750 in
Gun Rail: Picatinny
Gun Make: AR Platform
Included Accessories: None
Bolt Carrier Group Included: No
Charging Handle Included: No
Weight: 70 oz
Magazine Included: No
Mount Type: Picatinny
Country of Origin: USA

Features of Aero Precision M4E1 Threaded 20in 6.5 Grendel Complete Upper Receiver with Flash Hider w/ATLAS S-ONE Handguard

  • 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
  • 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
  • Compatible with mil-spec AR15 upper receivers and barrels

Package Contents:

  • Aero Precision M4E1 Threaded 20in 6.5 Grendel Complete Upper Receiver with Flash Hider w/ATLAS S-ONE Handguard
  • M4E1 Threaded Assembled Upper Receiver
  • ATLAS S-ONE Handguard of choice
  • 6.5 Grendel 20&quot Stainless Steel Rifle Length Barrel
  • .750 Low Profile Gas Block and Rifle Length Gas Tube
  • A2-style Flash Hider
  • Product comes assembled

Aero Precision M4E1 Threaded 20in 6.5 Grendel Complete Upper Receiver with Flash Hider w/ATLAS S-ONE Handguard Orderable Models

List of Orderable Models

  • Aero Precision M4E1-T Complete Upper, 20in 6.5 Grendel Stainless Steel Barrel, SM15, FDE Cerakote, APAR700335M53 , MPN: APAR700335M53 , UPC: 840014608423 , Code: 29D-UFH-EN2-APAR700335M53
  • Aero Precision M4E1-T Complete Upper, 20in 6.5 Grendel Stainless Steel Barrel, SM15, Anodized Black, APAR700325M53 , MPN: APAR700325M53 , UPC: 840014608416 , Code: 29D-UFH-EN2-APAR700325M53
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