I have the F1 master Chrony and love it. Unfortunately, it does not love 12 bore BP slug loads. Ahh, but being the foresighted genius that I am, I bought the optional plexi guards. Good thing too because an over powder card wad or a lube cookie at 1200fps really makes a mess of a naked Chrony. Also, get some 1/8" dowels and replace the steel rods with them. Muzzle blast from a Big Boy can hurl the screens into the next county so break-away rods are an excellent way to limit that travel.![]()