Hiya jack76590 and thx for your thread. To heavy of a recoil spring is more prone to cause the FTF you describe. Ya mention original recoil spring,assume you mean springs as the rami has two.And both should be fine with the ammo you were using. And less than 1000 rounds,and this is the first stoppage. So sounding like a fairy new gun,which should be fully under warranty, I'd always touch base first with cz-usa and take direction from their smith,at least initially. Could save your hours of time ,frustration,and even money trying to trouble shoot on your own dime.
On page 10 of your owners manual ,if the case has not been ejected,they say the cartridge chamber,extractor or ammo are dirty. (WWB is the dirtiest I've seen) or unsuitable lubricant in low temp environment. The ejector runs best dry,i.e. without driving oil on it. Cz expects on avg of 6 stoppages per 15000rds,maybe its one of the six. Most pistol courses teach about the half dozen typical ones and how to react quickly to clear the gun and move on. Recall Jessica Lynch reporting her M16 jamming and never getting a shot off. So expecting a stoppage at the worst moment and reacting quickly to it is mucho important. I had enough rami stoppages that it was sent to the safe and occasional range duty. Be well.
