Brn-601 5.56mm 20" Upper Receiver With Colt 4x21mm Scope
$847.99 at Brownells
In stock Sale
Brn-16a2 5.56x45 NATO 20" Bbl Upper Receiver W/Colt 4x21mm
No ratings yetBest price
$1,000.99at Brownells
Out of stock checked Oct 23, 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
- San Tan Tactical Everything But The Lower AR-15 5.56x45mm NATO … $980.99at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Brownells | $1,000.99checked 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.
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
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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 | $1,000.99 | $1,000.99 | $1,000.99 |
Since Sep 28, 2026.
About this part
The Brn-16a2 5.56x45 NATO 20" Bbl Upper Receiver W/Colt 4x21mm is a 2E+1" 5.56 / .223 upper receiver from Brownells. One store lists it, Brownells at $1,000.99.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Barrel length
- 2E+1" · Handguards
Specifications
- Manufacturer
- Brownells
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
The BRN16A2 features the correct components you're seeking in a M16A2 build. The forged upper receiver itself is the classic M16A2 style, with the robust and incredibly adjustable A2 rear sight assembly. The elevation drum can be adjusted from 300 to 800 meters (zero at 25m for 300m). This upper receiver does not have M4 feed ramps, just like the original A2. The included bolt carrier group has a phosphate finish with chrome bore and gas key interior. With the classic 20 inch Government profile 5.56x45mm NATO barrel, the BRN-16A2 has an instantly recognizable appearance. The 20 inch barrel has a chrome bore and chamber, with 1-7 twist, perfect for M855 62 grain or heavier bu Mfg: Brownells
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