Ol' Painless (Fallout 3)

Ol' Painless is a slightly more powerful .32 Hunting Rifle - it does slightly more damage per shot, and reloads slightly faster too. Can be found inside a safe in The Republic of Dave Capitol Building. Is repaired using ordinary hunting rifles.

There is also one inside the locked crate in the Muddy Rudder in Rivet City along with a bunch of other stuff. It requires a key however. The key can be pickpocketed from Brock the bouncer or Belle the owner. GLITCH- i did encounter a glitch however, i stole the key from belle and opened the crate, but got caught taking the stuff inside. I loaded a previous save and did the same thing, except now the crate wouldn't open and it would keep on saying that the crate requires a key to open. I reloaded and stole the key from Brock but the same thing happened. I don't know if Brock's key actually opens the crate, but the name of the key is the same as the one carried by Belle.