M5E1 Enhanced 18" .308 CMV Complete Upper Receiver

Aero Precision M5E1 18" .308 CMV Complete Uppers

M5E1 Enhanced 18" .308 CMV Complete Upper Receiver Product Sku: APPG308554P25

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 CMV 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

Gen 2 Enhanced Handguard Features:

  • 1pc free float design
  • 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
  • Gen 2 Feature - Quick disconnect sling socket at the 3, 6 and 9 o’clock positions
  • Gen 2 Feature - Additional milling along flats to aid with gripping and add visual appeal
  • Gen 2 Feature - New profile for the continuous picatinny top rail

18" .308 CMV Barrel Features:

  • Twist: 1 in 10
  • Threading: 5/8 x 24
  • Material: 4150 Chrome Moly Vanadium Steel
  • Finish: QPQ corrosion resistant finish both inside and out
  • Gas Block Journal: .750
  • Gast Port: .089
  • Gas System Length: Rifle
  • Weight: 56.64oz
  • 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: 83.09 oz / 12" M-LOK: 83.09 oz / 12" Quad Rail: - / 15" KeyMod: 84.99 oz / 15" M-LOK: 84.99 oz / 15" Quad Rail: -
Other No

Customer Reviews

6 Item(s)

Fit, finish, accuracy, and value. Review by Erik
I got this upper the black nitride bcg and an ambi charging handle for $500 during a weekly deal. I had never bought aero before but for the money, this will be the company I buy from again. I got sub-moa accuracy at 300yds. I don’t know any other brand that provides this much quality at such a low price point. If you’re thinking about doing an aero build, do hesitate. (Posted on 8/15/2018)
More than I expected Review by Michael
I recently picked up my 308 upper this week. The fit and finish to the lower itself was seamless. Next day I took it out to the range and fire my first few shots through it. Even with the flip up sites it was on paper 100 yards. The craftsmanship quality of it was superb. No rattling or lose parts at all. I have seen a few other bills from other companies that had some lose parts and play with in them. This aero precision upper was not the letter. When I look at the price tag of this product and compared to others it by far has the competition beat. Taking into the consideration of parts with the finish, it was damn hard to beat. (Posted on 5/4/2017)
Great complete upper Review by James
Matched this 15 inch M-Lok FDE upper with the M5 lower receiver, and I couldn't be happier! Very solid design. Great fit and finish. Super fast and free delivery! Aero Precision has my future business. (Posted on 12/31/2015)
Excellent upper. Don't cheap out. Review by Christopher
Top quality. Had issues with compatability of parts from other manufatures. Do yourself a favor and buy all Aero parts to complete your upper, mainly the BCG. You'll be sorry if you don't! You're only saving money until you have to re-purchase the same part to replace the junk you bought the first time. (Posted on 12/6/2015)
AP Upper Receiver Review by Steven W
This is my first rifle build and I have put a LOT of research into the build. For the money and quality AP can't be beat. I have read of issues with lower receivers and uppers not meshing well with some companies. too loss or too tight and needing adjustment. AP's uppers and lowers mesh perfect with no adjustments needed. Or so is the case with mine. Thank you AP for all that you do! (Posted on 8/22/2015)
good product Review by justin h
Haven't had a chance to shot with this yet. Due to im still building the rifle slowly. But it definitely makes the rifle look good. Would have given this a 5 star on quality, but since it didnt mesh with my lower, and had to take it to a gun smith. I gave it a 4. Quick shipping, received it in only 3 days as promised with the extra shipping of course. Likely to review again once i get their bcg and charging handle in. (Posted on 7/11/2015)

6 Item(s)

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