AR-15 M4E1 16 Upper Build Kit 5.56mm

Name: AR-15 M4E1 16 Upper Build Kit 5.56mm
Brand: Brownells
Availability: OutOfStock

Brownells · Upper Receiver

No ratings yet

Best price

$873.89at Brownells

Out of stock checked Oct 1, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$873.89checked Oct 1, 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.

Price history

Show

Dashed line = out of stock. Tracking since Sep 28, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Brownells	$873.89	$873.89	$873.89

Since Sep 28, 2026.

About this part

The AR-15 M4E1 16 Upper Build Kit 5.56mm is a 5.56 / .223 upper receiver from Brownells. One store lists it, Brownells at $873.89.

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

This complete upper includes Aero Precision's new ATLAS S-ONE Handguard! The S-ONE line of handguards are designed with size and weight in mind, providing the perfect addition to your lightweight build. Aero Precision's proprietary ATLAS attachment system is a durable and dependable mounting platform, maintaining a slim profile while still providing the strength and stability customers have grown to love from Aero Precision handguards. M4E1 Threaded Assembled Upper Receiver comes with a 16" 5.56 Mid CMV Barrel. The upper also features a low profile gas black, M4 feed ramps, .250 takedown pin holes, laser engraved T-Marks, and includes port door as well as an installe Mfg: Brownells