Why motor6d breaking tools?

I am currentily making a first person shooter and the viewmoudles have been working fine but now for some random reason there breaking the guns when i attach the part1 to them with a motor6d, here is a example

https://i.gyazo.com/62c0ac780773f755c803834ba8a49976.mp4

Motor6D will automatically set the position of part1 to the part0. I suppose you didn’t connect the mag and other parts that are left because you intend to animate them. You should connect the unmoved parts to each other with Motor6D too.

They were already welded and connted with motor6Ds i could anmite them before but i cant not for somer reason

https://i.gyazo.com/ae562a7c6fc4b41ae6c05c582de0862a.png