What are some pros/cons of using a stun gun vs. a taser for self defense? Do either require a permit or license to carry RALSPEC M-LOK Handguard QD Rifle Sling Swivel Mount Adapter Quick Clamp-on design. Quick Release Detach QD Sling Swivel Attachment w/ 20mm Picatinny Rail... Package includes: 2 x Sling Adapter, 2 x Allen Key Outer Diameter: Approx. 35mm. Inner Diameter: Approx. 30mm. Ring size: Approx. 11x8mm Clamp-on design. Dual round/oval loops for sling attachment. Package includes: 1 x Sling Adapter, 1 x Allen Key Picatinny Rail QD Swivel Loop Sling Push Button Quick Release Detach With Rail Sling Picatinny Rail Sling Mount