The Koparkhairane police have yet to recover the firearm in the incident involving a 21-year-old man who was arrested for firing three rounds at his 20-year-old ex-girlfriend, in which one bullet pierced her back and another bullet grazed her 23-year-old elder sister’s head near the ear, as she shielded her, at their chawl house in Sector-1 behind Terna College on Thursday around 9.30 pm.