How could I make players arms and head follow your mouse up and down?

So I am trying to make a good gun system but I wanted to know how to do this:

how would I do it?

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Something to do with CFrames. Not sure but that’s the hint.

Mhm I thought so. Since the arms and head always follow the mouse

The way they actually work this out, they find the Motor6D in the rig and then use script to change those joints, the API reference is here: Motor6D | Roblox Creator Documentation

Based on some calculation of their mouse together with RunService.Stepped, you can achieve this on client with buttery smooth results.

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use runservice.RenderStepped and mouse positions or cframes, but usually cframe and equal it to the characters[bodyparts] cframe or position