Hi all I have 2 cz 75 pistols One I have been using in copetitions since 1978 and I must use 0.357 heads, the 0.355 heads tumble.above the extractor is a No. 80. The other one has the No. 91, now my questions are, are the barrel bores on the early CZ 75 larger than the later models and if the No. shown on the slide above the extractor is the year of manufacture would the later model have the 0.355 barrel bore?
PS having used it since 1978 I have only had to replace a worn extractor Thank uou CZ for such a wonderful pistol

mike