LAV mentioned it in the video, and I thought it worth repeating: Tom Cruise realized how important it was to get the gun play accurate in one of Michael Mann's films and while I’m generally speaking not a huge Cruise fan, Cruise actually trained with former special forces instructors, using live ammo, until he could execute the drill in real life before shooting the scene.
His time on film was actually faster than the director wanted him to do it.
It is all one take and it is actually Cruise in the scene, not a stunt double.