M5E1 Enhanced 20" .308 CMV Complete Upper Receiver

Aero Precision M5E1 20" .308 CMV Complete Uppers

M5E1 Enhanced 20" .308 CMV Complete Upper Receiver Product Sku: APPG308554P27

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
  • 20" .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

20" .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: .087
  • Gas System Length: Rifle
  • Weight: 59.68oz
  • DPMS Barrel Extension
  • HP and MPI Tested
Made In America? Yes
Platform M5
Series M5E1
Caliber .308 Winchester
Barrel Length 20"
Weight(s) 12" KeyMod: 87.09 oz / 12" M-LOK: 87.09 oz / 12" Quad Rail: - / 15" KeyMod: 88.99 oz / 15" M-LOK: 88.99 oz / 15" Quad Rail: -
Other No

Customer Reviews

10 Item(s)

My Second M5E1 with a parts issue Review by Marcus
The short story - I put together a second M5 and had feeding issue.
Note many of the parts are Not from AP so that might be the issue.
It seems there is a feeding issue with unfired rounds getting physically getting stuck in the barrel, and not allowing a second round to load.
I must remove the lower and use a lot of force to pull the charging handle back to extract the round from the chamber. Yes, 3 diff brands of ammo and diff mags were tested.
The gunsmith will tell me if I need to have the barrel re-bored, or if it is something else.
Note all my AR-15 from Aero work flawlessly 100% happy with those.
That said as this is my second M5 with a parts issue, I will not be buying anymore M5's from AP. (Posted on 8/13/2018)
Great quality Review by Michael
I have completed my .308 build with this upper and I am very happy. Fit and finish are great. Added a nickel BCG and this rig is ready. Great packaging by Aeroprecision, the upper was safe and sound. No stratches, no damage.
Smooth action, great finish, great quality. (Posted on 8/9/2018)
Outstanding Review by Mark
The first firearm I ever owned, shot, and held was the M4E1. Purchased, and pieced it together from here about 7 months ago. Love it.
Just a few days ago purchased the M5E1 through my local FFL, came home, and pieces it together. Not only does it look rad, the weight of it after assembly has amazed me. It’s freaking light!! Aero, you have a lifetime customer. Thank you for the outstanding product! (Posted on 5/24/2018)
Everything and more! Review by Dejan
Great price, phenomenal look, top-notch quality! AP customer care is fantastic only wish they made the Atlas-S for their 308 variant, but that's being petty. Even the packing was STELLAR! Looks great on my platform! Two thumbs up! (Posted on 2/4/2018)
Really good upper, but a couple hiccups Review by Chris
I've had this upper for a while, and I am very happy with it, but it does have 2 problems that stand out: there are several points on the lugs that have burs, and this upper does not like soft point ammo at all. Hollow point or plastic tip it shoots with 100% reliability, but if soft tip is your preferred bullet you might be better off with another make. (Posted on 11/22/2017)
If you are looking for a AR10 but on a more affordably level without paying top dollar for a Daniel Defense or a Colt look no further. Review by Anonymous
Just like any company I have read a couple of negative reviews about their products and/or customer service. After doing a little bit more research I decided to go with Aero Precision and would not look back from that. I am pleased that I was able to get a 20inch barrel made out of 4150 steel along with a 15 inch KeyMod handguard. Finding a rifle that is made out of aluminum and not polymer made me very happy. I have made that mistake in the past and will never repeat it. I continue to look forward to the day when Aero Precision has their complete lowers back in stock so I can break this new rifle in. (Posted on 10/3/2016)
Great looking product Review by Chris
One of the nicest upper I seen and bought can't wait to shoot this thing (Posted on 4/14/2016)
Excellent Product & Price Review by David
I love this complete upper. The finish and quality are 5 star all the way! The Cerakote finish is flawless and matched my non Aero FDE lower perfectly. The accuracy of the upper is superb. You can bet this won't be the last Aero Precision product I buy. Keep up the great work guys! (Posted on 11/26/2015)
Can't beat this deal high quality complete upper at this price unheard of Review by Vince
I was really happy when I received my package and opened it up to find exactly what I wanted, exactly as explained. Everything on it was flawless , the finish was very nice, no scratches. Love how they integrated the free floating hand guard into the upper so it looks like one solid piece,Pretty awesome. Overall I was very happy with the product . But one thing they could do better on is the packaging. It was wrapped in a few sheets of foam and one thing of bubble wrap, loosely wrapped in a loose box. Other then that everything was awesome I give em 5 stars for quality, appearance, and price. (Posted on 10/3/2015)
Looks like a good company to work with as far as buying a upper from. Review by Daryl dexter
Good price for a 308 20inch uppers. (Posted on 7/1/2015)

10 Item(s)

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