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Duster is still a gas, and you will want to dry fire a few shots after filling to get the pressure levelled a bit (used to have to do this with my KJW M700), but you may lose 100fps from duster, which would put you in a nice pocket for velocity, and use 0.36g BBs. Just remember, there are two types of duster gas, diflorouethane and tetraflorouethane, the latter of the two being of higher pressure. Find the composition usually in the warning label on the side of the can.
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