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Aero Precision M5 .308 Assembled Upper Receiver - BLK

Aero Precision M5 .308 Assembled Upper Receiver - BLK

The M5 .308 Assembled Upper Receiver comes with both the port door and forward assist hardware preinstalled. Forged from 7075-T6 aluminum, this assembled upper is precision machined to accept standard .308 components and is the perfect upper for your big bore build. Match this with our M5 .308 lower receiver for a solid and dependable fit.


  • M4 Feedramps
  • .2795 takedown pin holes
  • Laser engraved T-marks
  • DPMS High Profile (.210) Tang)
  • Includes port door and forward assist


Out of stock

Out of stock
Aero Precision M5 Complete Upper - 12.5" - .308 w/ Atlas R-ONE Handguard

Aero Precision M5 Complete Upper - 12.5" - .308 w/ Atlas R-ONE Handguard

Aero Precision 12.5" .308 CMV Barrel, carbine length upper receiver. Forged upper receiver from 7075 T6 aluminum, .2795 takedown pin holes, Atlas R-ONE handguard with quick disconnect sling sockets at the 3, 6 & 9 o'clock positions. Threading is 5/8 x 24 made up of 4150 chrome moly vanadium and includes dust cover and forward assist.


Out of stock

Out of stock
Aero Precision M5E1 Enhanced 18" Complete Upper - .308

Aero Precision M5E1 Enhanced 18" Complete Upper - .308

This Complete Upper includes our Gen 2 Enhanced Handguard! Key features include the addition of quick disconnect sling sockets, enhanced milling design for grip and visual appeal and a new profile for the picatinny top rail.


  • M5E1 Assembled Upper Receiver
  • Gen 2 Enhanced Handguard of choice
  • 18" .308 Stainless Steel Barrel
  • Low Profile Gas Block and Rifle Length Gas Tube
  • Product comes assembled
  • This complete upper does not include a BCG or Charging Handle.

M5E1 Upper Features:

  • Forged from 7075 T6 aluminum
  • Precision machined to our specs
  • M4 feedramps
  • Laser engraved T-marks (Anodized only)
  • .2795” takedown pin holes
  • Accepts standard AR .308 components
  • Comes with forward assist and port door installed
  • Handguard mounting platform is forged into the receiver

NEW Gen 2 Enhanced Handguard Features:

  • Added quick disconnect sling socket at the 3, 6 and 9 o'clock positions
  • Milled additional surfaces along flats to aid with gripping and add visual appeal
  • New profile of the Picatinny Top Rail
  • 1pc free float design
  • Rail is Machined from 6061-T6 Aluminum
  • Built in Anti-Rotation tabs
  • Scalloped rails
  • Continuous top rail
  • 1.78" inside diameter fits most muzzle devices and 1.5" suppressors
  • Compatible with low profile gas blocks


Out of stock

Out of stock

AR-15 Upper Receivers

Find the Upper Receiver Parts You Need for your AR-15 Gun

Customize or begin building sooner with our AR-15 Upper Receivers. We have receivers boasting hard chrome-lined chambers and bores that deliver exceptional endurance and easier maintenance. Choose from a fast 1:7 twist or the popular 1:9 rate in our selection of AR-15 upper receivers. Top names in receiver manufacturing are here, including Rock River Arms, CMMG, and ArmaLite. These makers emphasize testing prior to shipment for your satisfaction. CMMG conducts magnetic particle testing on its barrels, a process which reveals tiny flaws. Order a Carbine Upper Receiver with M4 feed ramps and Bird Cage flash suppressor from this manufacturer.

Get the Rifle You Really Want with AR-15 Upper Receiver Parts

Make a match rifle or a versatile hunting firearm with AR-15 upper receiver parts. The AR15’s modular structure allows you to modify its design to meet your aspirations. Find a flat top so you can reconfigure as needed. We carry an M4 version of the AR15 carbine – its flat top provides a range of sighting options. Many of our AR-15 upper receiver parts are made from higher grade, mil-spec steel and work with existing mil-spec lowers. We’re also your superlative source for AR 15 parts sold individually, from charging handle assemblies to sling mounts.

AR-15 Upper Receiver Assembly Ensures Components Coincide

When you want the complete package, we’re here with assemblies! You can opt for an AR-15 Upper Receiver Assembly featuring a 16-inch barrel and a 1:9 twist, paired with a flash suppressor, mount, bolt assembly and charging handle. A dedicated bolt to match the upper assembly is important to the workings of your AR-15. You’ll also benefit from a handle matched to your barrel. Choose AR-15 upper receiver assemblies backed by precision manufacturing to add to your rifle or when building a firearm from square one.