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Old October 17th, 2010, 23:10   #7
venture
 
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Join Date: Jun 2005
Location: Halifax
When calculating a cylinder for your barrel use 1.7 x the volume of the barrel as a base number for the volume of the cylinder. For a stronger spring you should go higher to account for higher compression. 1.7 is just a starting guideline for a stock spring of 280-300fps with .2g bbs.
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