Aero Precision M4E1 Threaded Complete Upper Receiver 5.56 16in Mid-Length Barrel 1-7 Twist 15in ATLAS R-ONE Handguard A2 Flash Hider Cerakote OD Green
$569.99 at OpticsPlanet · 2 stores
In stock Sale
M4E1 5.56 NATO Assem Uppr Rcvr M4 16" Bbl Mid-Length Black
Aero Precision · Upper Receiver
No ratings yetBest price
$543.99at Kentucky Gun Co
Out of stock checked Oct 23, 2026
In stock now instead
- Aero Precision M4E1 Threaded Complete Upper Receiver 5.56 16in … $569.99at OpticsPlanet
- Rock River Arms Completed Upper Receiver Elite Carbine A4 .223/… $527.00at MidwayUSA
- Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembl… $567.00at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Kentucky Gun Co Best price | $543.99checked Oct 23, 2026 | Out of stock | Buy at Kentucky Gun Co | |
| Brownells | $565.99checked Oct 23, 2026 | Out of stock | Buy at Brownells | |
| OpticsPlanet | $589.99Salechecked Oct 23, 2026 | Out of stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Similar upper receivers in stock
This part is out of stock at every store we track. These similar upper receivers are in stock, with today's prices.
Rock River Arms Completed Upper Receiver Elite Carbine A4 .223/5.56mm 16 Inch Barrel 1-9 Twist Mid-Length Profile 1/2-28 Thread A2 Flash Hider Black
$527.00 at MidwayUSA · 2 stores
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Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, Black M4
$567.00 at OpticsPlanet · 5 stores
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Rock River Arms Completed Upper Receiver Predator Pursuit .223 Wylde 20 Inch Barrel Varmint Profile 1-8 Twist Free-Float Handguard Black
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Resolute Mk4 5.56 NATO Assembled Upper Rcvr 16.1" Bbl Black
$489.99 at OpticsPlanet · 5 stores
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Spikes Tactical .223 Rem/5.56 16" Barrel Complete Upper Assembly, Mil-Spec Phosphate Coated, Black Mid-Length
$598.50 at OpticsPlanet · 5 stores
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Price history
Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $565.99 | $565.99 | $565.99 |
| Kentucky Gun Co | $543.99 | $543.99 | $543.99 |
| OpticsPlanet | $589.99 | $589.99 | $589.99 |
Since Sep 28, 2026.
About this part
The M4E1 5.56 NATO Assem Uppr Rcvr M4 16" Bbl Mid-Length Black is an AR-15 complete upper receiver from Aero Precision. It's sold by 3 stores, from $543.99 to $589.99.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Gas system
- Mid-length · Handguards
- Barrel length
- 16" · Handguards
Specifications
- Manufacturer
- Aero Precision
- Color
- Black
- Type
- Complete
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
Aero Precision's M4E1 5.56mm Mid-Length Upper Receiver comes fully assembled, lacking only a bolt/carrier group and charging handle - the two components most often replaced by customizers. "Mid-Length" refers to the gas tube, which is longer than the standard carbine tube to slow down gas velocity and actually improve reliability in cycling. This is actually a carbine upper, available with either a military 14.5" or civilian 16" barrel (see Gun Tech Note below). The core of the M4E1 5.56mm Mid-Length Upper Receiver is Aero's forged M4E1 receiver that combines the looks of a machined receiver with "mil-spec" parts compatibility (including BCG Mfg: Aero Precision
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