if i use bindable event to increase the ammo of one player´s gun help ?

Hello, hope this helps:

--First Server script sender:
for i, plr in pairs(game.Players:GetChildren()) do
    plr.Backpack.Weapon.Recieve:Fire()--Weapon, name of your weapon, Recieve, name of your bindable event
end

--Second script reciever.
script.Parent.Recieve.Event:Connect(function() --The Name of your remote event, change receive to the name of your remote event
    script.Parent.Ammo.Value = 20 --Your ammo value
end)

Hopefully that helps.