When firing simultaneously, the bullets exit from interchanging barrels. So why is there kickback from both at the same time? I really wish they would kick from the correct hand, it'd be so much cooler. Nobody pulls both triggers at the same time... that's not fashionably killing.

Also, on many of the rifles, the left hand is floating in mid-air. I know these little things may not be important, but I just feel the game would look nicer without all these weird eye-sores.