Duster won't power a metal gun all that well. I've tried on my KSC Glock 17 after upgrading to metal, and it's pretty much useless. After a couple of shots, it won't even cycle back far enough to load a new BB in the chamber. Ditto for my TM P226 with metal upgrade. With my KJW M9, if I try duster, it vents all the gas on the first shot.
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