NCSTAR Shotgun Rails and Bayonet Mount Mossberg 500 Black. Fits most Home Defense models with the extended capacity 12G. magazine tube. Shotgun Magazine Tube mount includes two removable Picatinny accessory rails a sling swivel stud and the bayonet lug for securing M7 & M9 Bayonets. Includes front magazine tube cap that will interfaces with the bayonet front barrel/ muzzle ring mount. Compatible with the US M7 & M9 Bayonets. Easy to install onto the shotgun and he bayonet locks in place. Includes 2 side Picatinny accessory rails for mounting a flashlight and laser to your shotgun. Specifications for NCSTAR ShotGun Rails Bayonet Mount Mossberg 500: Manufacturer: NcSTAR Color: Black Gun Model: Mossberg Model 500 Gun Make: Mossberg Tube Diameter: 1 in Condition: New Package Contents: NCSTAR ShotGun Rails Bayonet Mount Mossberg 500 2 Picatinny accessory rails Mounting tools What firearm models does the manufacturer say NCSTAR ShotGun Rails Bayonet Mount Mossberg 500 is compatible with? The manufacturer says that NCSTAR ShotGun Rails Bayonet Mount Mossberg 500 is compatible with Mossberg Model 500NCSTAR MSHBAYMOS: Shotgun Rails and Bayonet Mount Mossberg 500 Black