Missing parts for custom gun mesh in Unity

Hello there again! I need help on figuring out how to fix missing parts for my gun’s mesh. Potential fixes that I was thinking about would be to use a script to combine mesh but it seems like a hassle.

This image shows the gun mesh having 5 submeshes which might be the leading issue:

Heres model breaking and missing parts(Its also super small):

Heres the mesh up close:

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