This QDA Plate allows for the quick detach/attachment of the popular push button style sling swivels. This will attach to any of the NC barrel clamps and once installed you will still be able to access the barrel clamp screw for easy disassembly/reassembly of the clamp. Can be used in conjunction with NC tactical barrel clamps. Comes with one #10-32 Flat Head Socket Screw required hardware for installation. NOTE: This is the attachment plate only, it does not include a push button swivel.