Trinity 6 Shell Shotshell Holder with Sight Mount for Mossberg 500 pump 12 Gauge 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