So, I've read some threads, and I think it's the firing pin causing the mis fire, because when I twist the battery sometimes, it will fire. It starts to misfire after 7-10 or so hits and I have to keep moving the battery around. I filed the firing pin, but I keep looking at my 18650 AW IMR button top, and on the top, it looks like scratches, I think my firing pin is jamming too hard into the battery to make contact. Sometimes when I fire, I see sparks, not sure if that's normal. Should I bend the firing pin upward a bit to prevent it from scratching the battery? Thanks !