AR15/M16 16" 5.56 M4 Barrel Assembly

Name: AR15/M16 16" 5.56 M4 Barrel Assembly
Brand: Colt
Availability: InStock

Colt · Barrels

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Best price

$372.99at MidwayUSA

In stock checked Oct 1, 2026

Buy at MidwayUSA

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Where to buy

Store	Price	Availability	Buy	Add to build
MidwayUSA Best price	$372.99checked Oct 1, 2026	In stock	Buy at MidwayUSA
Brownells	$359.99checked 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

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Lowest in-stock price in the last 30 days: $372.99 at MidwayUSA. Dashed line = out of stock. Tracking since Sep 27, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Brownells	$359.99	$359.99	$359.99
MidwayUSA	$372.99	$372.99	$372.99

Since Sep 27, 2026.

About this part

The AR15/M16 16" 5.56 M4 Barrel Assembly is a 16" 5.56 / .223 barrel from Colt. It's sold by 2 stores (1 in stock), from $359.99 to $372.99. The lowest in-stock price in the last 30 days was $372.99 at MidwayUSA.

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: 16" · Handguards

Specifications

Manufacturer: Colt
Platform: AR-15
Caliber: 5.56 mm NATO
Barrel length: 16"

From the manufacturer

Factory Colt 16" 5.56x45mm NATO Barrel Assembly ready for your next build. Barrel Assemblies includes front sight base, front sight tower & parts, handguard cap and barrel nut. Muzzle is threaded 1/2-28 for installation of various muzzle devices. Bore is chrome lined, for extended service life and corrosion resistance. Features 1-7 twist for superior performance with heavier bullets.

AR-15, Issue:11, Page:019
Big Book Catalog, Issue:70, Page:017