An emotional weapon. One’s ability to shoot off their mouth with hurtful, wounding remarks. If you’re shooting the gun, you are probably the one who has shot off your mouth. If you are on the receiving end, you have probably been the victim of someone’s wounding remarks or criticism. Also ask yourself if you are being too critical of yourself, shooting yourself down.
If the gun won’t shoot then your dream is showing you that you aren’t giving something in your waking life your best shot. Time to work harder.