Delta V Athena Red Dot Sight Mount Mossberg 500 509T Four Screw. These adapter plates allow for the mounting of a variety of red dot optics to a plethora of host platforms. Each part is inspected with calibrated precision measuring tools and checked against a model print to maintain the tightest tolerances. Specifications for Delta V Athena Mossberg Red Dot Sight Mount: Manufacturer: Delta V Finish: Copper Phosphate Gun Make: Mossberg Gun Model: Mossberg Model 500 Gun Type: Shotgun Fabric/Material: 4140 Alloy Steel Base/Mount Type: Top Mount Package Contents: Delta V Athena Mossberg Red Dot Sight Mount Delta V AP-M-004-A: Athena Red Dot Sight Mount Mossberg 500 509T Four Screw