Okay, so what you need to do is do freeze both the ammo and ur clip (30 for an ak) and the overall bullets (30/90=120 overall bullets)
there should be a tut for doing that somewhere on this site, I know you guys are gonna say thats serversided and crap but I went to pick up a diffrent gun and fired it, and while the bullets in my current clip went down the overall bullets went up. (fired a bullet,
29/91, 28/92 ect ect)
After you fire through all of your bullets you will just start shooting blanks, even though from your view you still have ammo. What your modifying is just the displayed value on your end and nothing more.