I bought an atomo clone from fastech. It came with a magnetic firing pin. well when i have my battery in the battery is loose. So i unscrew the screw at the top a little untill its fairly snug. well it starts firing on its on. i investigated a little and found that my firing pin extends just a little farther out than the bottom cap edges. so I need to either sand down the firing pin a little, or figure out a way to get it to screw farther down.... any suggestions/?