Yea it’s def the grip module. Your fcu is perfectly fine from what I can tell. That part that’s moving in the new video is just where the safety goes if you were to install one. It rotates normally to my knowledge. I’m certain in the grip module. Seems to be a hit or miss with the fitment of the grip modules. I think If you call sig, they will tell you it’s within spec. So if you do call them, I would be persistent about it being replaced cuz they might try to do the run around thing that I’ve heard from others. Also a replacement module could to the exact same thing so idk. From what I understand, it’s pretty normal for this to happen. I’ve seen countless posts about it and have two grip modules that do that very same thing so I guess it is somewhat normal. Some do it some don’t. Kinda annoying but it is what it is.