The Kinetic Research Group Arca Rail Heavy gives you Arca-Swiss rail functionality for your KRG Whiskey-3, X-ray, or Bravo chassis, plus it adds an extra 1lbs 3oz for a steady position to get you back on target fast at your next match. There are tons of possibilities for mounting and positioning accessories to your chassis with this rail. Attach your bipod or the KRG Barrier Multi-tool to the Arca Clamp and quickly position your item anywhere along the rail. You can easily remove or re-position for the next stage or even during a stage. Fits: KRG Whiskey-3, X-ray, and Bravo chassis.Notes: Use as many fasteners as possible to mount the rail to maintain rigidity. Does not work on 180-Series chassis.