15% HP: Japan Town, Cherry Blossom Market Ripper.
2% Crit Chance: Kabuki, "Allen Street" Ripper.
20% Crit Dmg: Heywood - Wellsprings, "Skyline and Republic" Ripper.
5% Armor: Fingers at Jig-Jig Street.
Note that these effects are only active and apply when your arm cyberware is drawn.