Gary Clark (Michael O'Neill), grieving husband of Alison Clark (Caroline Williams), wields a Beretta 92FS handgun throughout the Season 6 two-part finale (Episode 23: "Sanctuary" ; Episode 24: "Death and All His Friends").
As the S.W.A.T. first infiltrate the hospital during the lockdown in the Season 6 two-part finale (Episode 23: "Sanctuary" ; Episode 24: "Death and All His Friends"), one officer can be seen carrying what appears to be a Heckler & Koch MP5A2.
As Dr. Owen Hunt and Dr. Teddy Altman roll their GSW patient out into the parking lot on his gurney in the Season 6 two-part finale (Episode 23: "Sanctuary" ; Episode 24: "Death and All His Friends"), a police officer can be seen carrying what looks to be an M16A4 Assault Rifle, with a scope and RIS foregrip.
