Shadow 2 Type 3 Failure

[KingMem10]

I bought a used CZ Shadow 2 from Bass Pro and have been consistently getting type 3 malfunctions with 115 and 124 gr HSTs and Gold Dots. Every magazine of Jhp the third case fails to extract and the fourth round jams  under it. I have two “new” factory mags and one 20 year old. They all fail the same way. Great practice for clearing type 3s but obviously frustrating as hell. It feeds cheap fmj flawlessly. I’ve cleaned ejector and polished feed ramp but still can’t get it to feed. The gun was a little dirty when I bought it but really didn’t look like it had been shot too much. I  just ordered some 147gr Golden Sabers hoping a slightly longer round will load better but other than that I’m out of ideas. Any tips from the troubleshooting gurus would be helpful. 

[scatman]

Might try replacing extractor spring, or the actual extractor. Does it jam if you're trying to lock a round in slowly? Or while just racking through those first four rounds without firing? Do you notice any gouging on the case rims of extracted cases?

[KingMem10]

This is during live fire so all the extracted rounds hit the ground. I haven’t tried hand cycling the rounds.