AR-15/M16 18" 5.56 Mk12 Barrel SS 1/2-28

Best price

$199.99at Brownells

checked Sep 30, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$199.99checked Sep 30, 2026	Check store	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 AR-15/M16 18" 5.56 Mk12 Barrel SS 1/2-28 is an 18" 5.56 / .223 barrel from DPMS. One store lists it, Brownells at $199.99.

Fits and works with

Caliber: 5.56 / .223 · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Muzzle thread: 1/2x28 · Muzzle devices
Barrel length: 18" · Handguards

Specifications

Manufacturer: DPMS
Platform: AR-15
Caliber: 5.56 mm NATO
Barrel length: 18"

From the manufacturer

Heavy-contour 18" barrel is machined from high-grade stainless steel alloy, with a non-reflective matte black Teflon exterior finish. Chambered for 5.56mm NATO ammunition, 6-groove button rifled with a 1-8" twist. Extra length gives additional velocity for better potential long-range accuracy, with M4 feed ramps in the barrel extension and a rifle-length gas system for an extra measure of reliability. Compatible with any standard AR-15 upper.