Ol' Painless (Fallout 3)

Ol' Painless is a slightly more powerful .32 Hunting Rifle - it does slightly more damage per shot, has a slightly faster rate of fire, and reloads slightly faster too. Is repaired using ordinary hunting rifles. Ol'Painless is one of the few weapons with 0 spread, meaning non-VATS shots go exactly where you aim them. Its name may be taken from the name of the minigun from the movie Predator.

Location(s)

 * In an unpickable safe in The Republic of Dave Capitol Building. Dave's special key required to open the safe. - You can also get the Rifle from the Safe by electing Bob as the president instead of Dave (requires you to alter the votes however) and Bob gives you the combination to the safe - May possibly work by electing one of the other candiates instead, I didn't test that.
 * Occurence of Ol' Painless in the locked unpickable chest (Muddy Rudder Supplies) inside Muddy Rudder bar in Rivet City is a random event. Belle Bonny's Key (carried by none else than Belle Bonny) is required to open the chest, the key cannot be pick-pocketed.