TacStar Universal Barrel Mount #1 for 0.75 Inch Flashlight, Black - 1081111 Two-piece precision-machined mounts fit firearms from .22 caliber to 12 gauge. Attaches a 3/4 inch light to a 1/2 inch to 3/4 inch barrel. Attaches the T6 Flashlight or similar lights to the barrel. Mounts clamp on securely and easily.