Don't use a silencer imo, it just isn't worth it. Also, for true infiltrating, I still think Shield Regen is best. Reason being, you can't regen your shield while cloaked, so you'll want it to start regen ASAP so that you can cloak ASAP. Also you can't beat HA's close quarters if they pop their shield. It just isn't mathematically possible. You can outplay them often, but you will die more often than not to a HA with Resist Shield and half decent aim. And to TR players, yeah claymores are easy to see, you just need to be tricky. Drop them to the side of a door, for example. As long as an enemy steps over the green light, the claymore will trigger. If I drop claymores in a place with activity, they ALWAYS get me a kill.