Change a Weapons inventory slot

Hey, so I was trying to change the thumpgun to the rifle slot and have it use rifle ammo, and after I changed <ammo> to rifle and <inv_slot> to rifle in the weapons.xtbl file, it worked but now all my weapon upgrades disappear every time I load the game. My question is, what do i need to edit in order to change the inventory slot of a weapon without any errors?
 
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