GRS Versa-Pod Spigot The spigot fits the original and Versa-Pod style attachment bipods. It is very easy to install! Open up the bolt hole where the fastening screw is to be mounted to 5 mm. Insert the spigot into the Bifrost stock with the stopper facing downwards, towards the ground. Use the supplied short screw in the front Picatinny bolt hole to secure the spigot. If you are using the Picatinny rail on the bottom front of the Bifrost stock, use the longer screw to secure the spigot. The GRS Spigot gives you easy to use detachable bipod mount, close to the core of the barrel. This will be giving you better control when shooting with bipods.