+1 to the OP. Have been using an Impetus with X2 reflex for ages, and can often get decent killstreaks with it. It's the only weapon I'm happy with for close-quarters on the Infiltrator at the moment, as it has higher stopping power and firing speed over the scout rifles. This means you can take out a HA if one runs around the corner and you fire first and fast. I was using a suppressor for a while, but took it off as I hated the reduced velocity for moving or distant targets. I'll use a silenced pistol if I absolutely have to stay hidden, or will just cloak to drop the effect of spotting. It also allows you to fill a DMR-role in a squad, as it's still very accurate for mid-long range when holding breath.