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Old August 13th, 2009, 01:23   #4
L473ncy
 
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Join Date: Oct 2004
Location: 11-30-24-1W5
I read about it once somewhere, had to google for like 5-10 mins for the answer though but from what I remember it's to counteract/reduce "barrel suck" (although I think ported cylinders or something also do the same thing). From what I remember you only really need it for barrels longer than 580mm or something.
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