In the stand-off scene Adam Goldberg and Judy Marte keep switching pistols (obvious rubber dummies by the way) back and forth. Marte carries a Glock 19 when she is disarmed and then she and Goldberg take turns between shots as to who is holding a Glock 19 and a who is holding a SIG Sauer 226 or 229. This is most obvious when Goldberg is talking to the suspect and puts his pistol on the sofa as it goes from being a Glock to a SIG to a Glock to a SIG.