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Old January 10th, 2009, 12:11   #7
milehigh
 
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Join Date: Dec 2006
Location: Victoria
Apparently the fps drop with an undersize barrel on a full cylinder is due to the slower acceleration of the piston once it is released. On top of that, your BB will leave the barrel while your piston is still in motion, causing it to slam into your cylinder head, thus making it harder on your gearbox. It's almost like dry-firing.
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