Everyone should own a bore micrometer. I know they are expensive and am I glad I got mine many years ago. Not blowing the $ on one not so good gun will save you the price of the mic ten times over or even lots more. I take mine to gunshows and it has saved me thousands at a single bound. I really detest meatheads that backbore Perazzis.
Also knowing that numbers like 18.4 stamped on a Euro gun is probably a measurement in mm. And there are 25.4 of those little buggers in every inch. If there isn't a guide to continental choke markings in the faq there maybe should be. A basic one at any rate.
HTH
WtS
