Making first person weapon reload animations

Hi, I’m using ue4 and blender to make a few simple first person animations and I don’t know how to match clip removing animation (weapon animation) with arms animation. Is there any way to attach weapon in blender to make both animations at the same time or a different easy way? Doing it separately seems to be a bad idea. I use default arms skeleton from FP project and a default FPweapon skeleton