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Ray King (J.K. Simmons) is seen carrying what appears to be SIG-Sauer P229 in flashbacks to the Gambino massacre.
Glock 17
Brax (Jon Bernthal) along with some of his operatives are seen with the Glock 17. Christian "Chris" Wolff (Ben Affleck) also uses one at one point.
Heckler & Koch P30L
What appears to be a Heckler & Koch P30L fitted with a suppressor is seen in the hands of Brax (Jon Bernthal). The pistol is also used by one of his operatives.
Kimber Custom TLE II
Wolff also appears to use what appears to be a Kimber Custom TLE II fitted with a Surefire X300 weaponlight and a SilencerCo Osprey suppressor.
Rifles
Heckler & Koch HK416
Wolff fires what appears to be a Heckler & Koch HK416 fitted with a foregrip and scope/red dot combo sight during the final shootout.
Remington 700PSS
Some operatives are seen armed with what appears to be a Remington 700PSS while guarding a home.
Barrett M82A1M
Wolff is also seen firing a Barrett M82A1M, first to snipe cantelope from a mile away, and later in two separate fights.
Machine Guns
GE M134 Minigun
A GE M134 Minigun is discovered by FBI agents in Christian's house, mounted to cover the front yard.
Other
Weapons Cache
Wolff keeps a hidden cache of weapons inside a mobile trailer.
Special
Actor Ben Affleck underwent firearms training prior to taking on the role in the film.