INteresting German article on inner barrel diameter
 

Found this on Airsoft-news.eu and ran it through AltaVista's Babelfish German > English translator:

http://www.6millimeter.info/joomla/i...=150&Itemid=42

It's a comparison of several different stock and aftermarket barrels using a $500,000 Zeiss Prismo optical gauge (ISO 9001 certified) with an accuracy of 0.0014mm. Basically, it's a test to see if the 6.04 barrel the manufacturer claims really is a 6.04.

Interesting notes: Classic Army 6.04 is just as good as TM KN! Systema 6.04 is better. Prometheus 6.03 is best, slightly better than PDI's 6.01. King Arms Dragunov stock barrel and Swiss Arms M6 stock barrel = teh suq.

good find!