Blackhawk (Fallout 3)

The Blackhawk is an unique Scoped .44 Magnum. One of the most destructive mid-to-long range small guns in the game. Even Enclave Soldiers and high level Super Mutants can easily be decapitated by one well-aimed shot to the head. This is one of the best weapons in the small guns. Extremely high damage, and its accuracy is surprisingly high. The scope offers long range sniping ability as well, very good for non-V.A.T.S. usage.

It can be repaired with any Scoped .44 Magnum.

How to get it

 * This weapon is given as a reward from Agatha if you give her music sheet paper after the quest Agatha's Song. The sheet music can be found at any time, as long as you have access to Vault 92. If you failed to locate the sheet music inside Vault 92, there are copies in Springvale Elementary, Arlington Library, and Roosevelt Academy.
 * When Agatha gives you the pistol, its condition seems scales with player's level and/or luck.