Slick Side A1 5.56 NATO Assembled Upper Reciever Black
$202.05 at Brownells · 4 stores
In stock
M4E1 5.56 NATO Assembled Upper Rcvr Threaded W/M16 Cut FDE
Aero Precision · Upper Receiver
No ratings yetBest price
$155.99at Brownells
Out of stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells Best price | $155.99checked Oct 1, 2026 | Out of stock | Buy at Brownells | |
| OpticsPlanet | $174.99Salechecked Oct 1, 2026 | Out of stock | Buy at OpticsPlanet | |
| MidwayUSA | $174.99checked Oct 1, 2026 | Out of stock | Buy at MidwayUSA |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $155.99 | $155.99 | $155.99 |
| MidwayUSA | $174.99 | $174.99 | $174.99 |
| OpticsPlanet | $174.99 | $174.99 | $174.99 |
Since Sep 28, 2026.
About this part
The M4E1 5.56 NATO Assembled Upper Rcvr Threaded W/M16 Cut FDE is an AR-15 complete upper receiver from Aero Precision. It's sold by 3 stores, from $155.99 to $174.99.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Specifications
- Manufacturer
- Aero Precision
- Color
- Flat Dark Earth
- Type
- Complete
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
The M4E1 Threaded Upper Receiver features a new angular machined design that helps it stand apart from standard mil-spec upper receivers. This upper receiver features the same enhanced body profile as our M4E1 Enhanced Upper Receiver but is threaded to accept a standard AR15 barrel nut. It is forged from 7075-T6 Aluminum, precision machined to work with all mil-spec AR15 parts and includes the port door and forward assist pre-installed. The M4E1 Threaded Upper Receiver is designed to pair perfectly with our new M4E1 Lower Receiver giving you a billet looking receiver set at a fraction of the billet price. New enhanced forging that gives the upper receiver a ""bille Mfg: Aero Precision
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