The Magnum Quick Detach Super Swivels from Uncle Mikes are as solid of a foundation to attach a sling as you can find. These QD Super Swivels are designed to take a beating from shotgun rounds to heavy recoiling rifle rounds, these swivels will hold. FeaturesIncludes special adapter for Beretta 390 magazine capadapter also included for most pump and auto magazine capsWood screw base for butt-stockDoes not fit Browning 2000, Winchester 1400, Ithaca 37, Savage 30, Sears 21 or Stevens pumps.