Although best known for his work on the first six installments of the Saw franchise, Armstrong has also directed two films, the crime thrillers Pawn and The Assassin's Code.
[4] Armstrong went on to shoot other low budget independent horror films including Sam's Lake, Skinwalkers, and The Gravedancers (all 2006).
In 2009, Armstrong served as director of photography for the crime thrillers The Lodger and 2:13, as well the action-comedy Next Day Air.
Armstrong made his directorial debut with the action film Pawn (2013), starring Michael Chiklis, Ray Liotta, Common, Stephen Lang and Forest Whitaker.
[6][7] Armstrong directed his second feature, the crime thriller The Assassin's Code (2018), starring Justin Chatwin, Peter Stormare, and Mark Thompson.