Those photos of the chamber leade area are what I have seen on several CZ's, some look good to with no burrs. I have seen the burrs in other brands to including higher priced brands tho not as much. The best looking chambers I have seen on factory rifles are Anschutz and Sako. Some of the worst chambers and crowns I have seen are in the Rem 541S and T models. For the record I use a Hawkeye bore scope to check these.