GrovTec US Buttstock Sling Tail w/Push Button Base Adapter Black. Fits many rifle stocks with sling slots. Easily allows use of push button slings on carbine stocks without integral bases. Optional Rubber O-Ring for click silencing and piece of mind keeping the catch lock securely in place. Package Contents: GrovTec US Buttstock Sling Tail w/Push Button Base Adapter GrovTec US GTSL117: Buttstock Sling Tail w/Push Button Base Adapter Black