LIRISY Mossberg 500/590 Series Shotgun Picatinny Rail Mount, 13 Slots Scope Base Top Rail Mount;

This rail mount is built for Mossberg 500 and 590 Series or equivalent shotguns. It allows for the mounting of Picatinny or Weaver standard scopes, red dots, magnifiers, or other optics. The rail installs via the included set screws into the Mossberg factory mounting holes. The mount measures 5.5 inches long with 13 slots on the rail for flexible eye relief. It is a tactical, low profile top rail mount. Included SCREW SIZE is 8-40 (for mossberg manufactured after 1997).

Note
Our rail is made for post 1997 Mossbergs, if you have a pre 1997 Mossberg, the holes are shallower in size and require a different threading pattern. You will need 6x48 TPI screws (NOT Included) which you can find in a hardware store.