Weapon Trigger Sticking Thread

While testing out this rather Amusing Game, I have unfortunately came across a "sticking" in the trigger button (the weapon does not stop firing after you kill your monster). This ends up over using the precious Ammo that is already very scarce. It only seems to stick after holding down the button (about 1 1/2 - 2 seconds).
So what ever you guys need to do to fix that, I am sure that gamers everywhere will thank you.