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I have a G&P M3 and it might be the same as king arms. Is the little screw behind the bulb housing ? If so this is what completes the circuit to the batteries. If you take the batteries out and look at the coil in the light there is a little nut in the center. This is what that screw attaches to and holds the coil in place. I learned this after I unscrewed it but luckily I didn't lose anything. Hope this helps you out.
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