This may sound silly but...seriously. How? I have been playing the multiplayer for about a month now after taking about 9 months off. I have all the of the characters and am working on getting all weapons but I have yet to see a single level IV ammo from any pack.
When you start getting your Rares maxed you'll start getting a lot of level IV ammo in the Spectre / PSP / Arsenal / Reserve packs. --- "The act of treachery is an art, but the traitor himself is a piece of ****." - Mike Tyson
Ok, so not just rare weapons, but rare everything. I have every character but do not have all of them maxed, and I don't have every type of rare equipment maxed either. I just need to max out this damn collector rifle before I have all of the rare weapons maxed.