1. Go to vendor 2.buy all of ONE type of ammo from him(DO NOT CONFIRM PURCHASE) 3.sell 1 of that type of ammo back to the vendor 4.sell the rest of that type of ammo 5.check if you've successfully done the glitch by looking at the ammo you sold in your inventory, if one of that ammo is left after selling all of that ammo. If there is one of that ammo left then you did it 6.repeatedly sell the one glitched round that is in your inventory 7. Instead of spending a millennium pressing A or X, you go to the vendors ammo a d repeatedly buy that ammo. Hope this helped :)