Trinity Aluminum Scope Mount Shell Holder Kit Fits 12 Gauge Mossberg 500 590 835 pump FAST SHIPPING ANYWHERE IN USA-WE SHIP MONDAY THRU SATURDAY TACTICAL MATTE BLACK ANODIZE FINISH DURABLE ALUMINUM, EASY INSTALLATION:https://www.youtube.com/watch?v=lsGF2Y0fC2c ALLOWS FOR THE MOUNTING OF PICATINNY OR WEAVER STANDARD ACCESSORIES: SCOPES, RED DOTS, MAGNIFIERS, FLASHLIGHTS OR OTHER OPTICS 6 SHELL HOLDER AND TOP SIGHT/SCOPE RAIL MOUNT KIT