Same thing happened to me one time. I just avoid that server now, they told me its a known issue :/

Yeah Bazz i had the same thing happen to me and my friend we killed about 45 zombies with our guns on that hill. But its good im not the only one noticing the zombies constant spawning on people.

Also my game will still CTD at some points while on main menu or server select and in game.

I think i know what you are talking about. If you go outside on that side of the building you will see a shed going into the side of building. It clips thru the wall and makes it difficult to get behind the stairs. I think this is the "weird metal fragment" you are talking about.

You must not be looking properly cause i find maybe 1-2 heli sites per-server and they either have a lot of ammo or the guns. The FNX is no where near as rare as the M4 is all I can tell you is keep looking or give up. :/

I had this same issue but i fixed it by unloading the clip dropping it and reloading it. Its not a duplicate its the same clip but in and out of your gun.