Infiltrator (The Pitt)

The Infiltrator is a scoped, silenced assault rifle that will be added to Fallout 3 with the release of The Pitt downloadable content pack in March 2009.

It will function like then Silenced 10mm Pistol in that you can shoot at enemies without alerting others. It is probably more powerful that the 10mm pistol and is probably the most powerful stealth weapon. The scope also means it can fire from a distance, probably similar to that of a sniper rifle.

It is dropped by the last enemy you must fight in the fighting arena of The Pitt, The Arena. You must fight three slaves in order to gain audience with Ashur, but you must kill each before succumbing to radiation poisoning. After defeating the third and final enemy, he drops the Infiltrator, and you get a new perk which raises your Radiation Resistance. You will also have completed a quest, gaining an achievement and experience points.