Joshua's Pistol Whippin' .45 is a non-playable weapon in the Fallout: New Vegas add-on Honest Hearts.
As a companion, Joshua Graham will use this weapon when prompted to use Melee Weapons. As the name implies, it is Graham's unique .45 Auto pistol, A Light Shining in Darkness held by the barrel and used to "pistol-whip" enemies with the butt end of the gun.
Its special V.A.T.S. attack is called ‘lights out’.
It is considered an improved holdout weapon, meaning that this weapon can be snuck into casinos if the player's sneak skill is 50 or more.
It takes appearance as a rolling pin in your pip-boy.
Joshua's Pistol Whippin' .45 appears in the Fallout: New Vegas add-on Honest Hearts, but cannot be taken by the player without the use of mods or console commands.