Yes, it works fine, but it is not exactly the best tool for the job. You have to disconnect it between shots to swab or reload, then reattach. it has a system of shims that need to keep it at about 1/4" below the bore. It does get some muzzle splatter, and will need cleaning, but that does not seem to affect it. Its more aimed at a centerfire, and can do shot strings, measuring each shot as from a mag fed centerfire. The system has its pros and cons, it does work well, but its not really the right system for a ML with the removal and reset for each shot. I got mine after destroying several shoot through types, and pretty much before labradar made its debut. I kind of doubt, after using one, that I would choose to buy that system for ML use again.