?Just about all the hand stop and sling systems in use on target rifles today employ a heavy duty quick release 1 1/4" push button sling swivel. This swivel cup accepts any of these push button swivels, and can be mounted anywhere with a machine screw or wood screw. The 34-2750 set includes one “cup” and one 1 1/4" heavy duty swivel. The cup is Uncle Mikes and QD swivel is Command Arms.
Sinclair, Issue:5B, Page:220