Mister Holdout

Mr.  is a shady fellow living in Nevada in 2281.

Interactions with the player character
Mr. Holdout is willing to sell Holdout weapons to people looking to get into the Gomorrah casino. You can also pass a stealth check [50] for XP. He will also occasionally sell silenced pistols. Since the guards take all of your weapons, it might be helpful to pack some of his stuff.

He will not sell to the Courier if their reputation with the Strip is too high.

Appearances
appears in Fallout: New Vegas.

Behind the scenes

 * Holdout is a term for concealing and hiding cards on one's body.
 * Additionally, a 'holdout gun' is another name used to refer to a pocket-pistol or derringer: handguns of very small size and caliber, making them easy to conceal, and meant to be used in emergencies or situations where conventional weapons are inaccessible.
 * Mr. Holdout will sell you a 10mm pistol, but you do not get to keep this in the casinos unless you have a high enough sneak skill (Pistol probably has to be silenced though).