Um, I am pretty sure I've done all of that while in the military. >_>
True, but what he's saying is this :
If you deploy with your M16 with one magazine locked in, and three more full magazines with you :
You cannot fire off 3 shots, swap magazines, fire off 7 shots, swap magazines, fire off 25 shots, swap magazines, fire off 10 shots, swap magazines, fire off a full mag, swap magazines, and still magically have a full magazine after each swap UNLESS : you take a break and manually reload an emptied or partially emptied magazine with rounds.
That never happens on COD or BF games, with the possible exception of manual-load weapons like shotties and old rifles.
Perhaps Arma is more realistic than that? I don't know, it looks way too unpolished imho.
It's not a big deal imho, after all it's totally just a game. Getting shot point blank in the leg with a 7.62x51 round and running off jumping like a maniac isn't exactly realistic either. Or being nearly dead, hiding behind some boxes for 60 seconds, and being magically fixed lol.