This Deluxe Universal Shotgun Flashlight Mount is a tri-rail barrel mount and also fits shotgun extended mag tubes. The mount has a clamping feature with five mounting slots on rails for tactical flashlight adjustment. The mount is perfect for a tactical laser or tactical flashlight. Fits ATI MB3, Mossberg 500 Shotgun, Mossberg 590 Shotgun, Mossberg 930 SPX, Remington 870 Magnum Shotgun, Winchester 1200 Defender, Winchester 1300 Defender, Ithaca Shotgun Model 37 Defense, etc. Lifetime Warranty.