Mister Holdout

Mister Holdout is a shady fellow living on the New Vegas Strip

Background
Mister Holdout is willing to sell holdout weapons to people looking to get into casinos on the New Vegas Strip. He is standing outside of the Gomorrah casino and will hail the Courier when they first pass him.

Effects of player's actions

 * With no Strip reputation, Neutral, Sneering Punk, Smiling Troublemaker, Dark Hero or Soft-Hearted Devil, buying and selling prices will be unmodified.
 * A reputation of Mixed, Unpredictable, Merciful Thug or Shunned will gain 40% better buying and selling prices.
 * A reputation of Hated or Vilified will net 80% better buying and selling prices and Wild Child gets 85%.
 * Accepted or Good-Natured Rascal reputations garner buying and selling prices 40% worse than normal.
 * A Liked or Idolized reputation will prevent trading entirely. He will simply warn the player to stay away from him. The warning will be repeated as long as the player stands near him.
 * Killing him will cause the player to accumulate negative reputation with the NCR, though not with the Strip itself.

Other interactions
During interactions with Mister Holdout, the player can pass a Sneak check of 50 for XP.

Appearances
Mister Holdout appears only 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.

Bugs
If you convince him to sell bigger holdout weapons with the Sneak check, his inventory may nevertheless not change.