Slick Side A1 5.56 NATO Assembled Upper Reciever Black
$202.05 at Brownells · 4 stores
In stock
FDE M4E1 5.56 Assembled Upper Rcvr Threaded W/AR15 Semi-Cut BLK
Aero Precision · Upper Receiver
No ratings yetBest price
$159.99at Brownells
Out of stock checked Oct 23, 2026
In stock now instead
- Slick Side A1 5.56 NATO Assembled Upper Reciever Black $202.05at Brownells
- M16 A1 5.56 NATO Assembled Upper Receiver Black $206.75at OpticsPlanet
- TRYBE Defense AR-15 5.56x45mm NATO 16in Complete Upper Receiver… $257.47at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells | $159.99checked Oct 23, 2026 | Out of stock | Buy at Brownells |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
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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 | $159.99 | $159.99 | $159.99 |
Since Sep 28, 2026.
About this part
The FDE M4E1 5.56 Assembled Upper Rcvr Threaded W/AR15 Semi-Cut BLK is an AR-15 complete upper receiver from Aero Precision. One store lists it, Brownells at $159.99.
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
- Black
- 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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