also unless you are out completely one round remains in the chamber on a firearm (expl. if you have a 50 round clip and fire off 49 bullets when you put your next clip on it would have 51 rounds)
Well, the system BF uses is more realistic than MoHAA, which is good.
I like the Operation Flashpoint system, where you keep your clips if not emtied. But then again, throwing them away is always an alternative.