How do I move a part smoothly in a tool?

Hello! I do not know if this breaking rules but I hope not.

I really wanna make a bolt action gun, I have all the scripting done but theres one thing. I cannot figure out how to move the bolt smoothly. I have tried transparency and other stuff but I want it to be like one of (For example) nocols guns or phantomforces bolt action (I do not want to make a 1st person gun)

May anyone please link me a wikilink or just a basic example so I could do it.

Best Regards,

TechGamar

Nocol Example: https://vimeo.com/user97327797/review/330126021/aded92b66d