FEATURES -For Mossberg 500, 835, 590, 930, 935 & Remington 1100, 12 gauge -Provides three different ways to mount your sling or accessories: -Picatinny rail -Push-button base -Standard locking swivel stud -The steel magazine tube mount gives extra security to the 12 gauge extended magazine tube -Rail & push button base are reversible & can be mounted to either side