Home
Accessories & Parts
Barrels
Mk12 SPR 18" barrel kit for Mod 0 and Mod 1 rifles

Mk12 SPR 18" barrel kit for Mod 0 and Mod 1 rifles

Potomac Armory

$485.00 - $786.00

SKU:: CHMK120299
UPC:
Availability:: generally in-stock, and will ship in 2 to 4 weeks, allowing for coating. In rare event that we are waiting on barrel shop, we will place in backorder status
AEM Collar Selection:: in comments mention SHORT or LONG, or we default to first available.

Mk12 SPR 18" Barrel Kit for Mod 0 and Mod 1 Rifles Product ID: 1346 | Price: varies | URL: /mk12-spr-18-barrel-kit-for-mod-0-and-mod-1-rifles/ ============================================================ -->

The Mk12: Where Match-Grade Precision Met Special Operations Doctrine

The Mk12 Special Purpose Rifle is iconic among precision-focused operators. Developed in the early 2000s by U.S. Navy SEAL Team DEVELOPMENT GROUP and fielded by NSW (Naval Special Warfare) and other special operations units, the Mk12 represents a deliberate choice: sacrifice the portability of the M4 to gain precision out to 600 meters. An 18-inch stainless steel match-grade barrel is the heart of that design. Without that barrel, you don't have a Mk12. You have a modified AR-15. The barrel is everything.

The Science of the 18-Inch Mk12 Barrel

The 18-inch configuration is the sweet spot for the Mk12 platform. Long enough to maintain velocity and barrel-time for consistent 5.56 ballistics, but short enough for practical operation in vehicle and building entries. The stainless steel construction manages heat and thermal stability—critical for a rifle that fires precision groups shot after shot. The match-grade profile delivers accuracy that standard barrels can't match. This isn't a defensive rifle; it's a precision platform that extends the effective range of 5.56 beyond what most shooters expect.

Charlie's Custom Clones is the Mk12 authority. Nobody else assembles these barrels with the same attention to component fidelity and accuracy verification. We source the barrel, spec the muzzle device correctly, verify the bore concentricity, and ensure the entire kit integrates with both Mod 0 (with carbon fiber handguard) and Mod 1 (with KAC RAS) receivers.

Building Your Mk12 from the Barrel Up

The barrel kit typically includes the barrel and muzzle device assembly. From there, you'll pair it with the correct handguard (Mod 0 uses PRI carbon fiber; Mod 1 uses the KAC Free Float RAS), precision bolt carrier group, and a quality optic (Leupold Mark 4 LRT or similar). The Mk12 loves quality ammunition and benefits from precise setup. This is a build that rewards craftsmanship and precision ammunition.