No offense, ZZ, but sometimes people don't want to be told.
Lol true.
But I do think I see a point in the topic. Instead of five lines of ammo piles, combining them into 1 pile, but limiting the space in the inventory just the same. Something like a Weight system, so you would have a maximum inventory space, but you wouldn't have to see all items individualized as they are now. Or stacking items (like ammo) into one inventory line, but they take up 2 "slots" in the inventory. A number could be listed beside the item in the inventory, telling how many slots the stack takes up, and ammo stack sizes would not have to be changed or adjusted for a weight system. Some users would wonder about why the inventory goes from A-U to A-T or less, but it should be an easy enough concept to explain in the instructions.
And if you don't read the instructions... how did you learn to fire?