NcSTAR NC Star MWBM, Rail Bipod Stud Adapter Weaver/Picatinny type rail mount with Sling swivel stud/bipod Adapter Provides Sling swivel stud as a mounting point for slings or bipods that mount to swivel studs, like NcStar precision grade bipods Mounts to most Weaver/Picatinny MIL-STD 1913 type rails