Flak

 is a former slaver from Paradise Falls who now lives in Rivet City with Shrapnel. Together they run the Flak & Shrapnel weapons store in the Marketplace.

He is one of the targets for enslavement that Eulogy put a special bounty on. According to Paradise Falls' gatekeeper, Flak sold the slavers out to Rivet City in order to gain shelter there. Before enslaving him, Flak is unkillable. This ensures that there will always be at least one live target for Strictly Business.

Flak and Shrapnel share their store's inventory, so buying or selling from either one of them will update both of their stocks. This means that if Flak is enslaved by the player for Paradise Falls, Flak and Shrapnel's store will still be open. They consistently have a larger amount of caps than the other shops in Rivet City, making them prime sources of cash in exchange for unneeded loot.

Flak can also repair the unique Alien Pistol.

Appearances
 only appears in Fallout 3.

Bugs

 * If Flak is enslaved and the player is not successful in subsequently removing the collar to free him, this will cause Shrapnel to disappear from Rivet City and no trading will be available.  Observed on PS3 version 


 * Shrapnel may start patrolling between Paradise Falls and Rivet City, trading is still possible.


 * If the Mysterious Stranger kills Flak, he is dead. Not unconscious...dead.


 * If the player chooses to enslave Flak and then releases him from Paradise Falls, he may be found back in Rivet City doing his usual routine. The problem is he is now missing his dialogue options. When interacted with, he will just have a line stating "You saved me from those bastards. I won't forget it." Shrapnel will also mysteriously disappear.


 * For long periods of time and a lot after Doctor Li moves to the Jefferson Memorial, you will find Flak trapped in Li's room behind an Average lock with Shrapnel waiting outside. He will not leave until you break in and shoot him which of course makes everyone in Rivet City start gunning for you. (Only seen so far on Xbox 360 version) NOTE: I'm on a PS3 and this has just occurred to me.