I don't know what you mean with "keep clicking the L key while out of ammo, can keep firing bullets that aren't there". The M700 IS there, but I have to fix something on the states - the animation doesn't work. Just don't put 10 mines in one place. And what is wrong with the ammo system?
And if you mean the Gov vs. Rebels, do you ever read the server name, which usually includes the hosts name?
Well, the ammo system was the reason why Strato's weapon packs were failbinned from RTB. Just a warning. The ammo count is too slow to match the actual ammo after shooting.
The AP, if you say so, is fine.
M700 is fine too if you say so.
Glock, keep spamming the L button when you've run out of ammo and you'll find yourself shooting a few real shots even though you hadven't reloaded completely. You will inturrupt reloading because of your shooting and when you press L and left mouse click at the same time, you'll shoot shots, even when you've depleted all your ammo.
Edit: Clearer terms: Keep pressing L and clicking to shoot when out of ammo. Click at the same time and keep doing it. Watch as you shoot, while your ammo is 0/15.