Ultimate Arms Gear Sling Swivel Stud Adapter To Weaver Picatinny & Stud Rail Mount QS Quick Shoe System for Ruger 1022, 10/22 10-22, Mini 14, Mini-14, SR556, SR-556, SR22, SR-22 Rifle Mounts to Existing Swivel Stud. Provides a 3 Slot Picatinny Rail Section for Rail-Mounted Accessories such as Bipods, Lasers, Lights etc. Features A Side Swivel Stud To Maintain Continued Use of Shoulder Strap. Easy to Install. Weight - 3oz.