How to Setup Weapon For My Custom Character Model Because I don't have Any Arms Model Separately Like NolanFirstPersonArms Model

Please read this page for more details on arms rigging, etc:

First Person Arms - Opsive

The arms use a generic model setup so they require the animations to be created specifically for that rig and cannot use Unity’s animation retargetting . . .
opsive.com opsive.com

Also take a look at the FPS Mesh Tool (linked on that page) which can be used to split your mesh into just the arms.

I would also recommend watching these two setup videos, which explain in more detail the correct method for setting up a first person character and a shootable weapon:


 
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