Goto action within a Movie Clip

So I’ve got a movie clip in a scene called “Luger”. At the end of the movie clip, I want it to go to frame 50 of a scene called “Arms”. So, on the last frame of the movie clip, I have the action:

gotoAndPlay(“Arms”, 50);

Incredibly simple, but of course, it does not work. It goes to frame 50 of the movie clip; not frame 50 of Arms. I’ve tried labelling frame 50 of Arms, and having the action simply direct to that label, but it just went to frame 1 of the movie clip.

It seems there is no way out of the MC… help?