Brn-4/M27 5.56x45 16.5" Medium Chrome Lined Barrel Phosphate

Name: Brn-4/M27 5.56x45 16.5" Medium Chrome Lined Barrel Phosphate
Brand: Brownells
Availability: InStock

Brownells · Barrels

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Best price

$279.99at Brownells

In stock Sale checked Oct 1, 2026

Buy at Brownells

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Where to buy

Store	Price	Availability	Buy
Brownells Best price	$279.99Salechecked Oct 1, 2026	In stock	Buy at Brownells
Ammunition Depot	$349.99checked Oct 1, 2026	In stock	Buy at Ammunition Depot
Palmetto State Armory	$309.99Salechecked Oct 1, 2026	Check store	Buy at Palmetto State Armory

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: $279.99 at Brownells. Dashed line = out of stock. Tracking since Sep 27, 2026.

Show the prices as a table

Store	Latest	Lowest	Highest
Ammunition Depot	$349.99	$349.99	$349.99
Brownells	$279.99	$279.99	$279.99
Palmetto State Armory	$309.99	$309.99	$309.99

Since Sep 27, 2026.

About this part

The Brn-4/M27 5.56x45 16.5" Medium Chrome Lined Barrel Phosphate is a 16.5" 5.56 / .223 barrel from Brownells. It's sold by 3 stores (2 in stock), from $279.99 to $349.99. The lowest in-stock price in the last 30 days was $279.99 at Brownells.

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: 16.5" · Handguards

Specifications

Manufacturer: Brownells
Platform: AR-15
Caliber: 5.56 mm NATO
Barrel length: 16.5"

From the manufacturer

"M27" inspired 5.56x45mm Barrel for the BRN-4A(R) platform Not previously available in this configuration, the BRN-4 M27 16.5 inch 5.56x45mm NATO chrome lined barrel features a forward mounted bayonet lug. Manufactured by Faxon for Brownells, these manganese phosphate barrels are machined from 4150 chrome moly steel, and feature a precision buttoned rifle 1-7 twist bore with chrome lined 5.56x45mm NATO chamber. The bayonet lug attaches after installation of the gas block. The bayonet lug installs the same way as the gas block, with a simple coil pin driven in from the side. This makes for an extremely robust mount for a bayonet. Be sure to use a BRN-4 16" gas Mfg: Brownells