Swampfox LJA-ISJ-304B: Ironsides Shield is named after the U.S.S. Constitution, famous for such tough construction that enemy cannonballs bounced off her hull during the War of 1812. \"Old Ironsides\" was built from oak and pine, but our Ironsides are made from SUS304 blackened stainless steel. Slip Ironsides Shield over your Justice dot sight and install using the supplied extra-length screws. All shock forces from racking, drop testing, and other impacts are routed around your Justice optic and straight to the mounting footprint area, protecting the scope inside. Ironsides Shield is cheap insurance for those who know their optics will have a harsh life of constant use and abuse.