Boris McGiver
From Internet Movie Firearms Database - Guns in Movies, TV and Video Games

Boris McGiver wields a SIG-Sauer P226 as Hersh in Person of Interest - Season 2.
Boris McGiver can be seen using the following weapons in the following television series:
Television
Weapon | Character | Title | Note/Episode | Date |
---|---|---|---|---|
Steyr SSG 69 | Mr. Greene | Kidnapped | "Pilot" (S1E01) | 2006 |
Revolver Non Gun | Trevor Holt | Blue Bloods | "No Regrets" (S3E18) | 2013 |
SIG-Sauer P226R | Hersh | Person of Interest | 2013 | |
Glock 17 | Hersh | Person of Interest | 2013-2014 |