The Elzetta ZSM Shotgun Flashlight Mount works with 12-gauge shotguns from Remington, Mossberg, Winchester, and Benelli with at least 1-3/4 inches of free space on the magazine tube and barrel. Gauge Adapters are included for use with shotguns chambered in 20-gauge and .410. Weapon-grade flashlights from 0.7 to 1.1 inches in diameter (18 to 27 mm) may be used. This includes all Elzetta Modular Flashlights. The ZSM may be installed on either the right or left side of the gun providing natural operation of flashlight Tailcap switches. The position of the ZSM also allows for illumination of the front sight in many applications. Made in USA.