The Advanced Technology International Side Saddle is an excellent addition to your favorite firearm that allows you to mount optics and accessories easily and securely. This is an easy to install upgrade that will make a world of difference in personalizing "your" shotgun to meet mission parameters. When the best is needed, the Advanced Technology International Side Saddle is just what you have been searching for. This package also comes with Six Add-a-Shell Shotshell Holders to complete your load out needs.

Specifications and Features:
Military Type III Anodized, 6061 T6 Aluminum
Mounts Using Existing Screw Holes in the Top of the Receiver
Sleek Skeletonized Side Saddle Design
Weighs Only 3.5 oz
Three Mounting Locations on the Ejection Port Side
Six Mounting Locations on the Non-Ejection Port Side
Mounting Location for 6" Top Rail
Six Modular Add-a-Shell Shotgun Shell Holders
Military Type III Anodized, 6061 T6 Aluminum
Add as Many as Nine Shells in any Configuration
Secures Shotgun Shell Firmly in Place
6" Side Saddle Top Rail
Military Type III Anodized, 6061 T6 Aluminum
Mount Optics or Other Accessories Securely to the Top Rail
Weighs Only 1.25 oz

Fits:
Mossberg 500/590