The Kinetic Research Group Arca Rail XL is a longer version of the Arca Rail for mounting on the Enclosed forend only. 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 mounting and positioning acessories to your chassis with this rail. Attach your bipod or Barrier Multi-tool to the KRG Arca Clamp or another brand's clamp and quickly position your item anywhere along the rail, for example. You can easily remove or re-position for the next stage or even during a stage. NotesNot intended for use with standard chassis forendUsage with long action chassis will require removal of approximately 1/4" of material off the backend of the rail.Will not fit without modification on long action polymer or enclosed forend.