Great for Slug Shooting, Security, Home Defense, Turkey Hunting or Tactical Shotgun use. Full length top rail Perfectly contoured to receiver Installs using existing ports Made from lightweight aircraft aluminum Satin black finish. Weight:5oz Easy to install in existing pin port on the receiver - no gunsmithing or special tools required Solid one piece design of saddle style that straddles both sides of receiver Top Picatinny rail is 5.75 inch long and has 13 ring slots for proper scope or red dot sight placement Machined aluminum alloy body in anodized non glare matte finish Saddle scope mount for Mossberg 500 or Maverick 88 12 Gauge Pump Shotguns. Works with full size scopes and red dot sights with standard Weaver or Picatinny rings. Includes a polymer removable shell holder. This Universal 12GA Shotgun Shell Holder will attach to any Mil-Std 1913 Picatinny rail on your shotgun for fast and easy access to 5 shotgun shells, whether they be 2 3/4 or 3" shells. It securely holds them in place while on the go, and from the recoil of your 12ga shotgun. Constructed of high-grade glass-filled polymer, this shell holder will last you a long time. Length: 4.5" Width: 1.5" Weight: 1.3 oz