The AR-15 was a weapon that John Wick used in the assassination of Gianna D'Antonio.
Description
John asked The Sommelier for something "Robust. Precise." He recommended the AR-15 based on these needs, which John used in the assassination of Gianna.
It appeared in the film John Wick: Chapter 2.
John used the AR-15 in the catacombs battle that proceeded after he killed Gianna and fulfilled his Marker.
10) - Movieclips
John fighting with the AR-15.
Gallery
John sighting in the AR-15.
John using the AR-15 in battle.