Dont shows a part of actor after playing animation

Hello! I have this (MP5.blend) (790.6 KB) blender file and when I export that with YABEE to MP5.blend and MP5-shoot.blend (The animation) and I’m loading the files into an Actor and playing the shoot animation the magazine disappears. Why and can you tell me how to fix that or post the correct blend file? Thanks for your help! (I have the latest version of YABEE and blender version 2.79b)

Does anyone have an idea?