Nothing wrong with a used CZ, I've had a couple over the years.
The OP's problem, as discussed, was a weak extractor spring, no big deal, and the typically out of spec Wally World White Box. The new extractors supplied by CZ take Winchester's incorrect case groove into account.
I will never understand why some American ammo manufacturers insist on making metric caliber cartridges wrong.
Hell, Winchester barely gets it's White Box 45 ACP done right these days.
And it's all the fault of Wal Mart bludgeoning their suppliers to lower their prices.