M4E1 10" .300 Blackout Complete Upper Receiver

Aero Precision 10" .300 Blackout Complete Uppers

M4E1 10" .300 Blackout Complete Upper Receiver Product Sku: APPG600211P4

This Upper Receiver Handguard Combo now 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.


  • M4E1 Assembled Upper Receiver
  • Enhanced Handguard of choice
  • 10" .300 Blackout CMV Barrel
  • Low Profile Gas Block and Pistol Length Gas Tube
  • Product comes assembled
  • This assembly does not include BCG or Charging Handle. These products may be selected as add-ons under the Finish Your Build tab

M4E1 Upper Features:

  • Forged from 7075 T6 aluminum
  • Precision machined to M4E1 specs
  • M4 feedramps
  • Matte black hard coat anodized Mil 8625 Type 3 Class 2
  • Laser engraved T-marks (Anodized only)
  • Comes assembled, with port door and forward assist installed
  • Accepts standard AR15/M16 components
  • Handguard mounting platform is forged into the receiver
  • Works with Aero Precision handguards but also fits most BAR-system handguards
  • Barrel nut and wrench are included

Gen 2 Enhanced Handguard Features:

  • 1pc free float design
  • Built in anti-rotation tabs
  • Scalloped rails
  • Continuous top rail
  • 1.8" 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

10" .300 Blackout Barrel Features:

  • Length: 10"
  • Twist: 1 in 7
  • Muzzle: 5/8x24 Threaded
  • Material: 4150 Crome Moly Vanadium
  • Finish: QPQ corrosion resistant finish both inside and out
  • Gas Block: .750
  • Gas Port: .0935
  • Gas System Length: Pistol
  • Weight: 21oz
  • M4 Barrel Extension
  • HP and MPI Tested
Made In America? Yes
Series M4E1
Chamber .300 Blackout
Barrel Length 10"
Weight(s) KeyMod: 43.20 oz / M-LOK: 43.20 oz / Quad Rail: 44.80 oz

Customer Reviews

2 Item(s)

Great fit and finish! Review by Mandy
Was a little hesitant to buy a complete upper from a company I did not know much about, but after research I felt they (aeroprecision) is very much well known in the industry and a lot of companies go to them for parts.
So bought this upper for my noveski lower pistol I built and was extremely satisfied with fit and finish, they came together perfectly with zero play and especially because the lower is black and I bought the upper in fde it still looks like it was meant for each other.
Now for the important part, range time! Did a quick clean before taking it out. It was dirty, I do believe they test fire before sending out which I appreciate! I have 300 rds that went down range with this gun. At first I was zeroing so would send 3 rounds down, open her up then clean it with a few patches then repeat. Did this till I was zeroed at 25 yards. The only issue I had at first was the bolt would not lock back. Probably after the 12th round it started to lock back, but that was probably because it was a new buffer and spring designed for 5.56 and the 300 blackout doesn't have as much pressure.
But after 4 sets of 3 rounds it was locking back.
After sighted in I ran 30 rds bump fired without a hiccup.
Then took it to 50 yards. This is where I was most impressed, I was sending rounds down with flip up iron sights staying in a 2-2.5" group, was very accurate for a 10.5" barrel and shot extremely well and not one ftf out of 300 rds with 125 grain defensive rds and 124 grain fmj.
So I am extremely satisfied with my upper and do recommend it, and the fde matched dead on with my fde magpul grip, magazines, and thordson cheek rest. (Posted on 5/28/2016)
Excellent Review by Jason
This 10'' complete upper Is amazing! The quality and craftsmanship is very precise and well done. I highly recommend this product to anyone in the market. (Posted on 4/9/2016)

2 Item(s)

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