BRAND GOLDEN BOW LOADER spring 380pz -FOR ALL THE SERIES SIG 552 -COMPATIBLE WITH ALL BRANDS -LOADING OF THE SHOTGUN IS BY OPENING THE LID CLOSE TO THE EXIT HOLE OF THE SHOTGUN -TO MAKE IS THAT THE SHOTGUN ARRIVE AT THE ENTRANCE TO FISHING DOT RIFLE SHOULD TURN THE RING BEHIND THE LOADER -WITH ATTACK TO ADD OTHER SHIPPERS