Brn-601 5.56mm 20" Upper Receiver With Colt 4x21mm Scope
$847.99 at Brownells
In stock Sale
Best price
$823.59at Brownells
Out of stock checked Oct 24, 2026
In stock now instead
- Brn-601 5.56mm 20" Upper Receiver With Colt 4x21mm Scope $847.99at Brownells
- Retro Brn-601 5.56mm 20" Bbl Upper Receiver $719.99at Brownells
- Battle Arms Authority Elite 16" Upper 5.56x45mm Free Float M-LO… $824.99at GunMag Warehouse
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells | $823.59checked Oct 24, 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.
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.
Retro Brn-601 5.56mm 20" Bbl Upper Receiver
$719.99 at Brownells
In stock Sale
Battle Arms Authority Elite 16" Upper 5.56x45mm Free Float M-LOK Rail, Black
$824.99 at GunMag Warehouse · 4 stores
In stock
Mk4 Banshee Upper Receiver Group, 5.56 NATO, 12.5", Armor Black
$819.99 at OpticsPlanet
In stock Sale
Patriot Ordnance Factory Minuteman 16.5" Complete Upper 5.56x45mm 1:8, Black
$819.89 at Kentucky Gun Co · 6 stores
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Rock River Arms Completed Upper Receiver X-1 .223 Wylde 18 Inch Barrel 1-8 Twist 1/2-28 Threat Free-Float Handguard Brake Tan
$835.99 at MidwayUSA · 2 stores
In stock
Price history
Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Brownells | $823.59 | $823.59 | $823.59 |
Since Sep 28, 2026.
About this part
The AR-15 M4E1-T 14.5 Upper Build Kit 5.56mm is a 5.56 / .223 upper receiver from Brownells. One store lists it, Brownells at $823.59.
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
- Brownells
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
M4E1 Threaded Upper Receiver Features a new enhanced forging that gives the upper receiver a ""billet look"". The new picatinny profile that blends seamlessly with the Aero Enhanced R-Series Handguards. The receivers feature M4 Feedramps .250 takedown pin holes, Laser engraved T-marks, and includes port door and forward assist installed. The Brownells M16 5.56 Complete Bolt Carrier Group is constructed with a bolt made from 9310 steel, which is finished with a heat treatment and shot peening. The carrier is fabricated from 8620 hardened steel. Each element of the bolt-carrier group is finished in a black-nitride coating. The Brownells M16 5.56 Complete Bolt Carri Mfg: Brownells
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