How to stop code if IntValue is below a number?

I'm VERY new at coding and was trying to make a gun system in roblox. Right now I'm trying to make an ammo system. it works fine and counts down the bullets until 0 at witch point it will keep going into the negatives. I've tried using if statements but no matter where i put it, it doesn't seem to do anything.

Ammo = game.StarterPack["Deagle 44"].Ammo.Value

if Ammo < 1 then print("out") 

deb = false

function onActivation()

        if deb then return end -- start cooldown
        deb = true

        game.SoundService.Shot:Play(1) -- play shot sound
        Ammo = Ammo - 1
        print(Ammo)

        wait(0.5) -- cooldown time

        deb = false -- end cooldowm
    end 
end

game.Players.LocalPlayer.Backpack["Deagle 44"].Activated:Connect(onActivation)