TacFire Mossberg 500/590 Series Shotgun Tactical, Red Dot Sight Mount, T6 6061 Aluminum , 5.5 Inches Long with 13 Slots , Comes with Screws and Allen Wrench TacFire official product, Weaver/Picatinny rail mount for Mossberg 500 and 590 series shotguns, T6 6061 Aluminum , 5.5 Inches Long with 13 Slots , Comes with Screws and Allen Wrench Crafted from durable & lightweight 6061 T6 aircraft grade aluminum Allows for the mounting of Picatinny or Weaver Standard scopes, Red dots, magnifiers, and other optics. Installs via the included set screws into the Mossberg factory mounting holes Installs via included set screws into the Mossberg factory mounting holes Comes with 5 set screws (1 extra in case lost when installing) and 1 Allen wrench