This 5.5 rail mounts directly to a drilled and tapped Mossberg 500 12G receiver.
Features and Specifications:
Manufacturer Number: MTM500
Finish: Black Anodized
Material: Aircraft grade aluminum
Accepts all standard Weaver / Picatinny 1913 accessories
No gunsmithing required
Weight: 11.8 oz.
Mossberg 500, 590, and 835 models