He is using a 1911, the gun is in full profile, hammer down. He shoots the guy 3 times slowly; the camera shows, each time when he pulls the trigger, the hammer is already down, not cocked. You don't see the gun flash, but there is a flash from around the corner where the tub is. Hanks jerks the gun to simulate recoil (not enough for a 45 ACP). So...if it was a Para Ordinance double action version of the 1911, we would have seen the hammer come back with the trigger pull, and the quick action of the slide. The 1911 is not striker fired. So now, I think this scene was pure Hollywood, dummy gun, flashing light, and actor simulating recoil. Did anyone else notice?