The Professional

 is a perk in Fallout: New Vegas.

Effects
Up close and personal, that's how you like it. Your sneak attack criticals with pistols, revolvers, and submachine guns, whether guns or energy weapons, all inflict an additional 20 percent damage.

Bugs

 * Despite matching the description of the weapons covered by this perk, does not affect any weapons chambered for the 10mm round.
 * That Gun is unaffected by this perk.

Behind the Scenes

 * The Professional is a reference to the french movie Léon, also known as 'The Professional' and 'Léon: The Professional'. The plant next to the Vault Boy is a reference to the movie. Also, his clothes, hat, glasses, and face stubble portrayed by Vault Boy are identical to the character played by Jean Reno in the movie.