Fallout: New Vegas · Level perk
The Professional
The Professional adds 20% damage to sneak attack criticals with revolvers, pistols, and submachine guns; it requires Sneak 70.
How it works
The perk is listed at level 6 and requires Sneak 70. StrategyWiki says sneak attack criticals with revolvers, pistols, and submachine guns, including guns and energy weapons, inflict an additional 20% damage. Game8 also records an additional 20% for those weapon types. A separate bug claim in Game8 is not treated here as a confirmed effect.
Read the supporting references
Check the edition and source version for patch-specific details. Guide methodology.