function getupvalue(str)
   for _, a in next, getreg() do
       if type(a) == 'function'  then
           for i, value in next, debug.getupvalues(a) do
               if i == str then
                   return a, value
               end
           end
       end
   end
end

local func, logic = getupvalue("gamelogic")
input.InputBegan:connect(function(i, g)
   if not g then
       if i.KeyCode == Enum.KeyCode.LeftAlt then
           if logic and logic.currentgun then
               debug.setupvalue(logic.currentgun.addammo, "spare", math.huge)
               debug.setupvalue(logic.currentgun.addammo, "mag", math.huge)
           end
       end
   end
end)