Pistol Spree

From Halopedia, the Halo wiki

Pistol Spree medal icon in Halo: Spartan Assault.

The Pistol Spree medal is awarded in the Halo: Spartan Assault and Halo: Spartan Strike campaigns for killing three enemies in a row, with a pistol, without being hit.

Only the Magnum, Plasma Pistol and Needler count toward this medal; the Dual SMGs do not.