Sucks that you would have to do this, but maybe change your load-out to include the noob-tube and grenades and just keep lobbing explosives at them?

I don't play free-for-all, am mostly a team deathmatch player, so I have not personally run into this... 

you should see the leaderboards - some people have kill streaks of over 4,000. I don't believe that somehow. I mean, I know I'm a bit crap, but...

Technically you can have unlimited ammo if you have the scavenger perk equipped. Anytime you pick up ammo with scavenger it refills your weapons and your equipment.

wow never encountered it on psn

Yes people do this. I ran across it 3 times in a row when I left server for a different server because I didn't want to deal with it. I now know most of the spots where this can be done so if you see someone with a 0-15 record and the guy up top has 15-0 its pretty obvious this is happening. Once i start to see something gravitate towards this I go to the spot where they most likely could only do this at. I suggest creating a class with RPG or AT4Hs and danger close perk. Your explosions from the launcher will do more damage and be bigger. You can most likely take them out with that. Also equip tactical so when you get close to the spot they are doing this drop a tactical insertion in case they kill you so you can respawn next to that spot to stop them.

While I did encounter what you described, once I knew it was happening I hunt them done and finished him off. It was funny he was at like 18 when I killed him.

i dont really play free for all so never seen this, but my mates have told me how theyve done it.

Easy fix for IW. Make the tactical insertion only good for a maximum of 2 or 3 respawns.

lol

*Runs to play COD*

exactly, 2nd rate game praised as if its a 1st rate game. Like halo.... and other shooters....