M5E1 18" .308 Stainless Steel Complete Upper Receiver

Aero Precision M5E1 18" .308 Stainless Steel Complete Uppers

M5E1 18" .308 Stainless Steel Complete Upper Receiver Product Sku: APPG308534P26

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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 Rifle Length 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. These products may be selected as add-ons under the Finish Your Build tab.

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

18" .308 Stainless Steel Barrel Features:

  • Twist: 1 in 10
  • Threading: 5/8 x 24
  • Material: 416R Stainless Steel
  • Finish: Bead Blasted
  • Gas Block Journal: .750"
  • Gas System Length: Rifle
  • Weight: 51.20oz
  • DPMS Barrel Extension
  • HP and MPI Tested
Made In America? Yes
Platform M5
Series M5E1
Caliber .308 Winchester
Barrel Length 18"
Weight(s) 12" KeyMod: 81.94 oz / 12" M-LOK: 81.94 oz / 12" Quad Rail: - / 15" KeyMod: 83.84 oz / 15" M-LOK: 83.84 oz / 15" Quad Rail: -
Other No

Customer Reviews

2 Item(s)

Great value Review by DMG
Very pleased with my purchase exceptional product for the price! Will definitely be doing more business in the future. Thanks Aero (Posted on 1/8/2018)
Great upper Review by Keith
Ordered this for my first build. No tool marks anywhere and the finish is a good match between the upper receiver and the hand guard. (Posted on 1/7/2016)

2 Item(s)

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