Manipulating Bones

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I've created an animated model(.b3d) of a character for a 3rd Person shooter/action game. In the game, I have a targeting reticle that floats out in the game space, and I want the character's arm/weapon to track the reticle. I thought I could simply manipulate the "RShoulder" Joint using FindChild(model,"RShoulder"), and then applying the appropriate rotations. It didn't seem to work. The character is cycling through a "Mounted Rider" type animation, and I was hoping to override the right arm. Does anyone have any suggestions, or has anyone done this before?