Side saddle shell holder and optic rail for 12 gauge Stoeger M3000/M3500 Series Shotguns. Accommodates up to six 12 gauge shotgun shells. Mount allows mounting of Picatinny or Weaver standard scopes, red dots, or other optics. Installs into factory mounting holes of Stoeger M3000/M3500 with no additional gunsmithing required. All hardware included and installs in seconds.