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the p90 uses a 3/4 ported cylinder and is good for barrels upto about 400mm. Anything larger, you'll need a non-ported cylinder.
"M4 Cylinder = "3/4 hole" aka Type-2 17cc - 229mm(min) 430mm(max) barrel length"
quoted from acme airsoft.
Last edited by chaosnemesis; January 13th, 2010 at 13:29..
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