In game the ammo we use to shot it will be use as first or top ammo of inventory or ammo slot. but some ammo it have debuff like Venom bullet, Nano bullet etc. Then i propose to make a new button to select a ammo slot(like press "z" to select slot 1) to use as ammo slot as we select that will make game more advance such I select a Nano bullet for debuff then switch to Explosive bullet for doing damage. This is all of my little suggestion I hope this is helpful for any player that play as rangers more or less. thx :3