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What appears to be a Heckler & Koch HK45T fitted with a suppressor is seen in the hands of Brax (Jon Bernthal). The pistol is also used by one of his operatives. The Tru-Dot sights visible in the production still denote that this is a factory HK45T model.
During the course of the film Wolff uses a Para-Ordnance Black Ops 1911 fitted with a threaded barrel, magazine well, a Surefire X300 weaponlight, and a SilencerCo Osprey suppressor. This is the 14.45 variant with a 14rd doublestack magazine.
Wolff fires what appears to be a Heckler & Koch HK416 fitted with a foregrip, light, suppressor and Leupold HAMR/Delta point optic sight during the final shootout.
Actor Ben Affleck underwent firearms training prior to taking on the role in the film.
Error creating thumbnail: File missingBen Affleck training at International Tactical Training Seminars for The Accountant. To the left of Affleck is Scott Reitz, a 30 year veteran of the LAPD and a firearms instructor who has trained with US Army Delta and Seal Team Six.