This is very peculiar, the only explanation for this coming to my mind is that the creator of the model updated it and in the update he/she did something wrong.
I am just gonna not use those guns, considering they only work in a single game I made.
Not updated. This code is from early roblox. The code from early on would probably not work now, as they had deprecated and updated a lot of stuff. (Roblox at least.)
I would recommend using some of ROBLOX’s open source guns which can be provided to you here
https://www.roblox.com/library/3932996124/Pistol
https://www.roblox.com/library/3933198517/Shotgun
https://www.roblox.com/library/3933186135/Submachine-Gun
https://www.roblox.com/library/3933205594/Sniper
https://www.roblox.com/library/3932944456/Crossbow
https://www.roblox.com/library/3932970604/Grenade-Launcher
https://www.roblox.com/library/3933035051/Rocket-Launcher
https://www.roblox.com/library/3933019552/Railgun
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Yeah, but the animation that go along, I do not really like. Plus, this is star wars.
You can modify open source models in any way you like that’s the good thing about them happy developing 
You too. Thank you for helping!
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Anytime just feel free to ask have a nice day!
If your question has been answered, mark the person who had helped you as a solution.
I know, but none of these fixed the error.