Need help polishing a weapon model for 3D printing

I have the AN-94 weapon model from Bo2 ripped from a g-mod addon, but it isn’t fully what I am looking for, because some of the parts are too thin as well as there are few visible pylogons and some areas are missing the model completely making the insides visible.

I’m planning to 3D print the weapon and make it into an airsoft weapon, but I really need someone’s help, so please, if you are even slightly interested in helping me, post down below + PM me and I’ll post the model for you to work on as well as extra info what else I want from the model, thank you!

Disclaimer: I’m planning to use the model solely ONLY for personal use, and I am not going to attempt to advertise it, claim it’s my own product nor monetize it. Thank you!