Kinetic Research Group (KRG) ARCA Rail The KRG Arca rail gives you Arca-Swiss rail functionality for your KRG Whiskey-3, X-ray, or Bravo chassis. It's low profile and light weight and mounts to the bottom of the forend without being obtrusive. There are limitless possibilities for... MSRP: Was: Now: $74.99 Add to Cart