The Kinetic Research Group Night Vision Mount Cap is a full-length barrel shroud for the Whiskey-3 PRO Chassis. For those who require maximum grip area for their support hand or those who need to mount a clip-on thermal or night vision device in front of their day optic. Compatible with the Optics Inlet C-4 Barrel Shroud Rail. FeaturesFits: Whiskey-3 PRO, C-4 Chassis OnlyWeight: 4.5ozMaterial: Anodized Aluminum