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Old February 10th, 2009, 17:24   #4
Join Date: Dec 2005
Location: Ottawa
Looks like to save material KART decided to make the inner barrel smaller. Since making it a tightbore would be more expensive they reduced the wall thickness. I am trying to install a tightbore and nothing I have will fit down the outer barrel. I took my caliper and found the outer diameter of several barrels.

JBU - 8.54mm
Prometheus - 8.64mm
KART EBR stock barrel - 8.21mm

The stock barrel fits really snug and since I can't drill out the outer barrel I now need to buy an aftermarket outer barrel just to install a tightbore.

Just stay away from KART/ECHO1, they are shit.
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