Centurion 12.5" 6mm ARC Barrel – Includes Headspaced Bolt & Gas Tube
Better comes standard. The Centurion 12.5" 6mm ARC barrel is a high-performing option for builders who want serious accuracy in a compact platform. This stainless barrel features a factory-polished M4 feed ramp and ships as a full package including a headspaced bolt and midlength gas tube.
Specs:
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Material: 416R Stainless Steel
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Chamber: 6mm ARC
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Twist Rate: 1:7” RH
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Length: 12.5”
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Contour: RECCE Profile
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Gas System: Midlength
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Gas Journal: .750" with alignment notch
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Compatible with standard and MK12-style tabbed gas blocks
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Note: Superlative Arms gas blocks align with the front dimple only
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Barrel Extension: M4 Feed Ramps (polished at factory)
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Muzzle Threads: 5/8x24
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Weight: 1 lb 11.5 oz
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Gas Port Size: .082"
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Includes:
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Headspaced bolt
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Midlength gas tube
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Proven Performance
In testing, this 12.5" Centurion barrel has shown impressive accuracy across a range of factory 6mm ARC loads. It consistently shot sub-MOA, with particularly strong performance from:
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Hornady 80gr ELD-VT (sub-MOA results)
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Hornady 108gr ELD Match (best groupings overall)
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Other factory loads also delivered highly acceptable results
Better comes standard.
Want to know more about how we handle quality control? Check out the latest blog post for full details.
Looking for more build components?
Head over to the AR15 Stuff and Thangs tab to explore our full selection of upper parts, accessories, and more.
Centurion 18" 6mm ARC Barrel – Spec Sheet
Material: 416R Stainless Steel
Chamber: 6mm ARC
Twist Rate: 1:7” Right-Hand
Barrel Extension: M4 Feed Ramps (factory-polished)
Length: 18”
Contour/Profile: RECCE
Gas System: Rifle +1
Gas Journal: .750" with gas block alignment notch
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Compatible with standard and MK12-style tabbed gas blocks
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Superlative Arms adjustable gas blocks align with front dimple only
Muzzle Threads: 5/8 x 24
Gas Port Size: .096"
Weight: 2 lbs 3.5 oz (approx.)
Finish: Raw Stainless (lightly oiled post-inspection)
Includes:
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Rifle +1 gas tube
Additional Notes:
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Headspace checked in-house using Superlative Arms and CMC bolts — confirmed good to go
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Barrel does not include a headspaced bolt, but is fully compatible with standard ARC BCGs
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Passed full QC inspection at Ally Munitions, including borescope, gas port gauging, chamber check, and more
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Ideal for precision 6mm ARC builds looking to maximize velocity and maintain smooth cycling with the extended gas system
