The entire film was almost lost in post production due to multiple external hard drives failing.
Several members of the cast and crew are trained martial artists including Zach Scheerer who holds a black belt in Taekwondo, the stunt coordinator Deanna Page who holds a black belt in Shotokan Karate, and one of the directors of the film, Adrian Acevedo Smith, who also holds a black belt in Taekwondo.
The unique silver belt buckle that is part of Marcus's wardrobe was chosen by Scot Fontaine, the costume designer, and provided by the brand Obscurebelts.
The film's protagonist original name was John, and was later changed to Marcus in order to stand apart from various other action heroes who share the same first name (i.e: John Rambo, John Wick, John McClane, John Preston, etc.)
The Blackmagic Design Ursa Mini 4K was used to shoot the film and it was edited with Adobe Premiere Pro CC. Autodesk's Maya and The Foundry Nuke were used for the films visual effects.