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The following weapons were used in the film American Ultra:
The Glock 17 is used throughout the film, notably by Mike (Jesse Eisenberg).
Glock 17 (3rd Generation) - 9x19mm
The Beretta 92FS pistol is seen in the hands of Mike after taking it from Rose (John Leguizamo). Phoebe is seen holding a Beretta.
M249 Paratrooper SAW
A variant of the M249 Paratrooper SAW, fitted with a heat shield is seen used by Crane (Monique Ganderton).
M249 Paratrooper - a real blank adapted movie gun with bipod folded and a picatinny rail on the top of the feed tray cover - 5.56x45mm
FN Tactical Police Shotgun
Victoria (Connie Britton) is seen using what appears to be an FN Tactical Police Shotgun.
FN Tactical Police Shotgun - 12 Gauge
Heckler & Kock HK416D
Otis (Michael Papajohn) is armed with an Heckler & Koch HK416D.
HK416 in D10RS sub-variant with EOTech holographic weapon sight, RIS foregrip, AN/PEQ-2 IR designator, & Crane stock - 5.56x45mm
The M4A1 Carbine is seen in the hands of soldiers and SWAT members (this is seen in the trailer, but it appears to be stock footage).
Colt M4A1 Carbine with M68 Aimpoint scope and RIS foregrip - 5.56mm