Centurion Arms 12.5" MK12 Stainless Steel Barrel - OPS Inc. Compatible Contour

Centurion Arms 12.5" MK12 Stainless Steel Barrel - OPS Inc. Compatible Contour

Centurion Arms' MK12 Barrel (12.5") is a purpose-built precision component developed through extensive U.S. government testing to deliver unmatched reliability and accuracy for special operations platforms. Designed with the extended .750" profile forward of the gas block, this barrel replicates the original Crane Spec MK12 specifications, ensuring authentic performance and durability. While installation or removal of the gas block will inevitably mar any finish—just as with the original MK12s—this is a testament to its true-to-spec design and uncompromising functionality.

Crafted from 416R stainless steel, the barrel is optimized for use with MK262 ammunition (Black Hills 77gr equivalent), providing superior long-range precision and consistent ballistic performance. The 1:7 right-hand twist stabilizes heavier projectiles, while the OPS Inc. contour ensures compatibility with mission-specific suppressors. Compact at 12.5", it balances maneuverability with extended precision, making it ideal for high-performance recce rifles, designated marksman builds, and mission-configurable carbines.

Crane Spec MK12 Design
Authentic profile developed for U.S. special operations with proven combat reliability.

OPS Inc. Contour
Designed for compatibility with OPS Inc. suppressors and accessories.

Optimized Chamber for MK262
Engineered for Black Hills 77gr equivalent loads, ensuring consistent long-range performance.

416R Stainless Steel Construction
Delivers durability, corrosion resistance, and match-grade accuracy.

1:7 Twist Rate
Stabilizes a wide range of bullet weights, including heavier precision projectiles.

.750" Gas Journal with Alignment Notch
Works with MK12 tabbed or standard gas blocks for secure installation.

Proven Accuracy & Reliability
Trusted by operators in combat for precision shooting.

Specifications

• Chamber: 5.56 NATO, optimized for MK262 (Black Hills 77gr equivalent)
• Material: 416R Stainless Steel
• Barrel Extension: M4 Feed Ramps (Standard)
• Twist Rate: 1:7 Right-Hand
• Contour: OPS Inc. Spec
• Gas Port Size: 0.076"
• Gas Journal: .750" with alignment notch
• Gas System: Carbine
• Barrel Length: 12.5"
• Muzzle Threads: 1/2x28
• Weight: 1 lb 11.5 oz