the gen 1 marauder trigger drops right into the disco. it's more $$ but once you've shot it, you'll wonder why it took you so long to get it. you'll also need to fabricate a trigger guard or get a challenger guard from crossman as the mrod trigger group does not have a guard.but what a sweet trigger. soooo much better than anything you can do to the stock setup. 2 screw, 3 screw, polish, hone, whatever. the mrod trigger is better.
I did the brass trigger with just the two screw mod and I'm pleased with the result. May add third screw later but as of now I don't feel it's needed.