How to edit weapons smesh files?

Well, i been trying to edit the smesh files of the mac 10 to fix the mag/clip, but i dont know how to edit them pretty well. Somehow there is a mod from the McManus from GOTR/Sr1 model that fixes the clip model, so if someone knows how to edit the files, could tell me how i can edit them?
Link of the mod: https://www.saintsrowmods.com/forum/threads/restored-mcmanus-clip.18300/ (Created by BandiG)
 
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