The Reload / ammo selection radial should highlight the current ammo type.

Sometimes you equip a gun and forget what ammo is in it. Assuming you don't want to waste ammo finding out, you have to open the Reload radial and compare each number on the radial with the "rounds remaining" displayed in the bottom-right. This is time consuming and it doesn't work in all cases (two types having the same amount, or both having no spare rounds). Life would be much improved if the UI displayed the currently selected type.