Have us have an option to either select to view the guns, swiping through them and buying ammo by spamming space or simply just have a menu where we get all the guns in front of us just like in the dealerships and just type the amount of ammo we want in the blanks.
To explain further and elaborate :
Having this " menu " as the " view guns " ammunation menu with guns prices
https://imgur.com/a/7ONUPntAnd then for every gun you can just select how much ammo you want to buy
https://imgur.com/a/ByCmXcpReasons :
It saves so much time, you don't have to go through the menu and then spam for ammo, you can just buy as much ammo as you want and have the guns all in front of you, which makes everything way easier.
NOTICE : I suggest that this should be implemented as an " optional " feature, which means anyone should have the ability in /settings to switch back to the old guns menu.