Gunslinger

Gunslinger is a Fallout 3, Fallout: New Vegas and Fallout 4 perk.

Effects
While using a pistol (or similar one-handed weapon), your chance to hit in V.A.T.S. is increased by 25%. As with all perks that increase your chance to hit in V.A.T.S., this bonus is multiplicative, not additive.

Affected weapons in Fallout 4
Plasma Pistol, 10mm Pistol, Pipe Pistol, Pipe Revolver, Laser Pistol, .44 pistol, Pipe Bolt-Action Pistol (So long as grips are used. If a stock is added, the perk no longer applies to that weapon.)