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RTR 6mm ARC 18" Mk12 Mod1

Craddock Precision

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Discover Craddock Precision's RTR 18" 6mm ARC Mk12 Mod1, meticulously crafted for clone enthusiasts. Compatible with Allen Engineering or Otter Creek Lab SPR collar mounts, it offers seamless integration. Enjoy true-to-spec precision without gunsmith fitting hassles. Elevate your clone build with Craddock Precision's unrivaled quality and reliability.


  • 18" in length
  • Rifle Gas System (Gas Tube Included)
  • 6mm ARC Chamber
  • 40.7 oz
  • 1:7 Twist Rate
  • Enhanced / Enlarged Feed Ramps
  • Button Rifled Match Grade SS Blank
  • Mk12 Mod 1 /.750" Gas Block
  • Threads 5/8x24 with a 11° target crown
  • Three Half Fluting Options (Straight, Spiral, and Diamond)
  • Multiple Finish Options to choose from

Adding fluting or Cerakote to your barrel? Expect a 1-4 week turnaround for precision work and coating perfection.

For Cerakote Flutes Polish OD finish option, specify your desired Cerakote Color/Code in the checkout notes.