With superb CZ Customer Service support, I sent this CZ 75 TSO back to the factory to assess and repair this continuous failure to feed issue described in an earlier thread. My TSO came back in a surprising two weeks with a gunsmith's note that he replaced the extractor and test fired it with good results. Before service, the failure to feed rate was about 1 to every 8-10 rounds fired. Today I fired 100 rounds with 1 failure to feed - the bullet was jammed at the base of the feed ramp. I was firing three different .40 caliber manufacturers: 165 grain Speer Lawman and Winchester; and 180 grain PMC. The single misfire was a Speer Lawman round.
Obviously, the factory service made a significant improvement, but 1 in 100 is still not an acceptable failure to feed rate for this ultra fine firearm. I do plan to shoot another 100 rounds of only Winchester and PMC to help determine if its an ammo problem while closely tracking which mag, if any, produces a failure to feed, thus indicating a potential mag problem.
Any CZ Forum members ever have a similar problem?