Elzetta ZSM-T Tactical Shotgun Flashlight Mount (flashlight sold separately) attaches to barrel & magazine tube. The Elzetta ZSM-T is designed for 12-Gauge shotguns and also comes with gauge adapters to accommodate some 20-Gauge and .410 shotguns. Elzetta ZSM-T includes sizing adapters allowing installation of flashlights from 0.70 to 1.05 inches in diameter (18 to 27 mm). This includes flashlights from popular manufacturers such as InForce, Streamlight, Pelican, Laser Devices, SureFire, and of course, Elzetta Modular Flashlights. (Sizing adapters are not required when using an Elzetta Flashlight or other 1-inch Light). The Quick-Release Thumbscrew allows flashlights to be installed and removed rapidly and without tools. ZSM-T can be mounted to either side of the shotgun to accommodate left-handed or right- handed shooters. This glass-filled polymer construction provides outstanding durability, impact resistance, scratch resistance and light weight. It also withstands high temperatures, vibration, and most chemicals. The Elzetta ZSM-T works with Remington 870, Remington 1100, Remington 1187, Mossberg 500, Mossberg 590, Mossberg 590A1, Mossberg 835, Mossberg 930 SPX, Benelli M1, Benelli M2, Benelli M3, Benelli M4, Benelli Nova, Benelli Super Nova, Winchester Defender, and many other shotguns that have 1-3/4" (44 mm) of free space on the magazine tube and barrel. All Elzetta products, including the ZSM-T, are designed, engineered, and manufactured in the USA using American materials, tooling, and labor.