I solved this by using the rifleMocap default skeletal mesh for the animations and then assigning my own mesh to it. I manually attached the gun to the character/skeletal mesh with a socket. I’m pretty sure this is not the best way to go about it (especially as you have to attache the gun and reposition it every time you want to add a character to the scene) but strangely there don’t seem to be any tutorials on this subject.