User blog comment:Sperez2012/Mass Effect 2: Squad Talk/@comment-2256917-20120705231618/@comment-1388547-20120706215448

I actually strongly recommend Warp Ammo, because it's good against everything except shields, and as an Infiltrator (or if you have Zaeed around) you have Disruptor Ammo to deal with shields. It's somewhat less effective than AP Ammo against health and armor, but it adds bonus damage against barriers into the mix, which makes it just the thing for fighting Collectors and Eclipse mercs.