Spitfire Armory - MX Tactical Rear Sight for Mossberg 500 and similar shotguns Designed for use on Mossberg 500 and similarly tapped and shaped receivers Comes with mounting hardware and instructions for easy installation CNC machined from 6061-T6 aluminum with hardcoat anodized finish Use with the Ghost Ring MX Front Sight for complete system (see image) Note: For Mossberg 930, the rear sight has a slightly different fit. We are working towards a new product to work well with this model, but please contact us if you have any questions.