Criterion SPR/MK12 6mm ARC Barrels 1-7.5 Twist




This 6mm ARC barrel is a 18″, 1-7.5 Twist, rifle gas system and M4 feed ramps. You have the option of barrel type, thread, fluting, finish type and to add a matched bolt. If you have a bolt that you would like to use you are welcome to ship it to us for accurate headspace.

The barrel blanks are made from 416 Stainless Steel.

Note: SPR/MK12 and Recon threads are 5/8-24 and if you choose fluting it will only be under the handguard.

  • Manufactured by: Compass Lake Engineering

Additional information

Barrel Brand



Gas Block Area


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Matched Bolt

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Barrel Fluting


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