Brn-16a2 5.56x45 NATO 20" Bbl Upper Receiver W/Colt 4x21mm

Name: Brn-16a2 5.56x45 NATO 20" Bbl Upper Receiver W/Colt 4x21mm
Brand: Brownells
Availability: OutOfStock

Brownells · Upper Receiver

No ratings yet

Best price

$1,000.99at Brownells

Out of stock checked Sep 27, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$1,000.99checked Sep 27, 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.

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