Hi all i have just aquired a 3 shot semi auto shotgun with a set of chokes two questions i have is which choke is which on the end there are grooves 1,2,3,4 and 5 how do the grooves equate to the choke size ie is 1 groove 1/4 choke please any advice would be great also does anyone know where i can get a set of instructions for the shotgun it is a concorde 12 g tried google but no joy just want to make sure its all ok and i familiarize myself with loading and unloading thanks in advance Pete