Spitfire Armory - MX Tactical Front Sight - Snub for Mossberg Designed to be placed in front of barrel bracket to accommodate high capacity magazine tubes Factory bead may need to be removed on some guns (see installation instructions) The sight base is CNC machined from 6061-T6 aluminum with matte black hardcoat anodized finish The clamping band is carbon steel, with black oxide finish Comes with shims to fit a range of barrel diameters