GRS Rifle Stocks Bifrost Spigot Black. Designed for quick and easy mounting this spigot enhances the functionality of the GRS Bifrost stock by enabling secure and stable bipod attachment. Specifications for GRS Rifle Stocks Bifrost Spigot: Manufacturer: GRS Rifle Stocks Color: Black Gun Type: Rifle Fabric/Material: Stainless Steel Finish: Oxide Last Chance: Yes Width: 0.43 in Weight: 0.21 lb Length: 3 in Package Contents: GRS Rifle Stocks Bifrost Spigot GRS Rifle Stocks 104560: Bifrost Spigot Black