For ease of use this doesn't have to be separate from the ammo check function. A small slightly brighter grey line at the top of the mag ammo indicator can be used to indicate that a round is chambered. We can have a separate check, idc really but for simplicity's sake the previous suggestion I think is best.
Cant count how many times I was SURE I finished reloading to hear a click when I needed the weapon to fire... in a row. So this small UI should add a QOL improvement for very little change and presumably effort. Thanks