Brn-601 5.56mm 20" Upper Receiver With Colt 4x21mm Scope
$847.99 at Brownells
In stock Sale
Best price
$924.99at 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
- Colt EPR II Pro AR-15/M16/M4 5.56x45mm NATO 16.1in M-LOK Upper … $929.99at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells | $924.99checked 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
Colt EPR II Pro AR-15/M16/M4 5.56x45mm NATO 16.1in M-LOK Upper Receiver Government Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate
$929.99 at OpticsPlanet
In stock Sale
ARAK-21 5.56 NATO Complete Upper Receiver 16" Medium Bbl BLK
$919.08 at Kentucky Gun Co · 5 stores
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LanTac USA LLC Urban Tactical Complete Upper Receiver 223 Wylde 11.5" Barrel Fits AR-15 Anodized Finish Black
$916.49 at OpticsPlanet · 2 stores
In stock Sale
MRP-L M-LOK Shovelnose 5.56mm 11.5" Assembled Upper Receiver
$940.50 at Brownells
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 | $924.99 | $924.99 | $924.99 |
Since Sep 28, 2026.
About this part
The AR-15 Stag 15 16 Upper Build Kit 5.56mm is a 5.56 / .223 upper receiver from Brownells. One store lists it, Brownells at $924.99.
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
- Brownells
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
Looking to take your AR-15 to the next level? Maybe you have a dedicated upper receiver designed for a particular task, and you're looking to open up your rifle's capabilities? This Stag Arms Stag-15 Tactical Upper Receiver is an easy swap for your mil-spec AR-15 lower, and it gives you options that broaden your options, and it gives you all of this in a high-quality package that's designed for premium performance. Each Stag Arms Stag-15 Tactical Upper Receivers are chambered in 5.56 NATO and feature a 16-inch barrel complete with a 1:7-inch rate of twist, which is designed to stabilize heavier-weight bullets, so you can sling lead downrange with greater energy and capabil Mfg: Brownells
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