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Seeing how shims come in .1, .15 and .2 mm sizes, .5mm is a lot of play. I'm assuming you mean .05mm? The stock motor you have has nowhere near enough torque for this build. Also, when you get a motor with stronger magnets, it will have more stopping power to prevent the double shooting, especially with the AB mosfet.
Since it's a DMR, you actually want a heavier piston assembly. It helps with consistency. On a 420-440 fps spring pre engagement shouldn't be an issue, especially with an AB mosfet. If you get a high TPA motor, ie 22+, your ROF will be low enough that you likely wouldn't see it anyway.
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