How do I set up my FPS like CSS where the player only sees his arms and guns?

And everyone else sees the entire body. I understand it’s two different models. I also understand this is vague. Just some basic info on how 1 camera doesn’t see the big model but sees a seporate model. Other cameras see the entire model and not the arms. Thanks.

You could stick the body into a separate layer, and set the following camera culling mask so that it doesn’t include the body. But other cameras culling mask has all objects.

Or just use Fatties option which is easiest and simplest and probably no noticeable performance hit. You can change the near clipping plane so that the arms appears the right distance from the camera.

Alternatively, you can purchase rigged arms from Unity’s asset server .
Also, you can find some free arm models on google.!