Instead of gun specific upgrades, I'd like to see Gun variants.
For Example: The PR would have a variant called "Phase Rifle Prototype" Which would be bigger, heavier, fires slower, and can't see the enemies through walls (though you'd still be able to shoot through walls by holding the scope for a while), but it can kill in one body shot.
For some guns it could be an attachment, like a suppressor for the USP.
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