Pasting what I said in the comments just in case it gets overlooked:

"There's a problem with this. Me and my friend both have it downloaded, we're running my private server. I can use the gun fine, but when my friend tries to use ANY of them, they don't even give her the gun. Why is this and how can we fix it? :I"

She sees it in her weapons tab, clicks on it, but isn't given the weapons/still has her physgun out. This SWEP works perfectly for me, she can hear the sounds as well, etc etc, but she can't use the gun.

I should also add that we both have the exact same addons installed so it's clearly no a conflicting mod