MSTR....Martz Safety Toggle Release, If you are right handed... it allows you to load a new full mag on a locked back toggle without changing your shooting hand grip had, AND release the toggle to charge the weapon and at the same time, taking it off safe?.... It works off the safety bar, and an added "S" shaped link fit / machined in the frame, connected to the hold open and basically pulls the hold open lever down, when you take it off safe... It works great!!! But, is really a can of worms to make, machine, & install? Although I know he did many when he first invented it, I don't think it was ever a profitable venture for him, or anyone... It was just something unique to JVM, and so it will probably remain so... best to all, til...lat'r....GT....
