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Old 10-06-2012, 03:51 AM   #16 (permalink)
K_Obeastly
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Join Date: Jul 2006
Location: Clinton, MO

I would say j&j, the BOA express had two rows of porting. Barrels of America Express Barrel | Paintball Review | pbreview.com
I do have some older J&Js that have a single spiral of very small ports and that is what it looks like to me. IIRC The palmers single porting still has two spirals of ports where the double ported has 4 and they only start in the last couple of inches.
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