Short story, I put a new extractor in it.
Some months back I started a thread on the extraction problems my Tisas 9mm Carry was giving me. It happened with all kinds of different mags and different ammo. It was a complete failure to extract with the spent case staying in the chamber after firing, causing a total malfunction and rendering the weapon inoperable. Interestingly, it didn't start happening til I'd had the gun a few months and had put a few hundred rounds through it. And to think after the first 50 or so rounds when I first got it, which ran flawless, I was carrying this gun. That's kind of unsettling. But a couple times a month I would practice with it and that's when I discovered the problem.
After a couple months of trying but not really trying to fix it I just stuck the gun in the safe and it became a pretty low priority. Couple weeks ago I decided to tackle this problem once and for all. I researched and watched some videos on how extractors work (16 years of gun ownership and shooting and I never gave it much thought), and learned pretty easily how to remove a 1911 extractor. I removed it, examined it, looked ok, cleaned it and cleaned the tube it goes in, then watched another video on how to add tension by bending it. I did that but it didn't look like it made much difference. Put it back in, took it straight to the range, same problem. Empty case stays in the chamber, total malfunction.
At this point I said to hell with it, the problem has to be the extractor, just get a new one. I bought a Wilson combat extractor and it arrived Thursday. Put it in that night and shot it Friday, 100 rounds. Used three magazines--a Wilson Combat, a Mecgar, and one of the factory mags which came with the gun. I had one failure to extract. Can't remember which magazine it was. But 1 in 100 was a lot better ratio than before, when it was happening just about every magazine.
Shot it again Saturday (yesterday), again 100 rounds. This time no failures to extract but I had two other problems. When shooting one-handed I would get stovepipe malfunctions. And several times the slide would not lock back after the last round fired, and this happened with all three magazines. I was pleased that it had no extraction failures, but obviously concerned about these new issues.
So I field stripped the pistol this morning and gave it a good cleaning, then shot it again. (I can shoot on my property at home.) This time 120 rounds, same three magazines. And...not a single problem. Flawless. No failures to extract, no failure to slide lock, no stovepipe. Shot it one-handed a bunch. Shot it slow, shot it rapid fire, did a couple mag dumps. It did great. I'm happy.
But I'm not totally persuaded this gun is fit for everyday carry so I will shoot it some more. But I think we're finally going in the right direction.