Slow, what are you talking about? Compression is a part of your fps, if you have an air leak, your fps will go down, if you have a good seal you'll have a nice fps. Yeah the friction of the rubber causes the bb to slow down, but I don't know if changing the rubbber will decrease it that much. The main thing you want to do is lower your spring. That will keep your gearbox alive longer and raise your rate of fire.
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