Gamo 621319854 Intermount Sights Mounting, 3/8-inch Allows the mounting of telescoping and Red dot sights to Standard 3/8 inch dovetail grooved receivers Fits Gamo Air rifles and Air pistols Mounts to 3/8 inch dovetail grooved receivers Made of durable material Easy to install Mounts to 3/8 inch dovetail grooved receivers