So you might Ask, why Fatal shot the mojo line of Fatal shot choke tubes is a result of a partnership between MOJO Outdoors and Rob Roberts custom gun works. Roberts has spent a Lifetime making shotguns pattern to their highest potential. He was one of the first to use state of the art Computerized pattern analysis machines to evaluate how shotguns shoot. This allowed Rob to quickly and easily test many theories as to what made the best choke, until he developed the true custom choke tube that is the standard for performance shotguns. Today Rob provides performance upgrades for Major gun companies such as benelli USA. And now, Fatal shot is the result of Roberts many years of experience in getting the optimum performance out of shotguns. Before Fatal shot, hunters and shooters would have had to purchase an expensive performance upgrade to get a choke of this quality. Together with our waterfowl (short, medium and long range), Predator and turkey chokes, these 5 chokes cover the entire shotgun hunting spectrum and other shooting sports! the Browning invector choke will fit these guns: Browning invector, Charles Daly O/U Italy, fn-slp 12ga, H and R 1871/N.E.F. 12 ga, H and R partner pump, H and R SB 130 trap and topper, Ithaca FS103P 37, Maverick, Maverick FS103P 88, miroku, Mossberg 500, 535, 930, 9200 and Maverick, pedersoli, Ruger older models pre 1992, skb short style (1.5 inch.