I just fired my recently acquired NP29 and the only thing it did was the thumb button on the mag release unscrewed itself. Other than this issue all was good, the gun was surprising accurate with nothing remarkable to mention. I've applied Loctite to the threads of the thumb button, hopefully this eliminates this problem.
I had to do the same thing. I bought 3 NP29s about 4 years ago. All shot poorly. had to replace the barrels. Did not think to slug them.
I have 2 of the np29 doing the same thing. One has about 3000 rounds threw it and the other more like 10000 threw it. Now I can only get about 2 rounds down and it locks up. Tried different types of ammo, new barrel link, new exreactor and using non stock mags. So now it sits in the safe. The first one sat at our local pro shop for about a year. With excuse after excuse on why they could not fix it. Finally I got mad and just picked it up. Now it sits in the safe.
If there is a smith out there that thinks they could fix them, please pm me.
"Then I had a serious jam.
The slide locked up with a spent case partially in the chamber and the slide about 1/2" out of battery. Couldn't figure out how to unjam."
Hammering a brass squib rod down the barrel has been the best solution I've found.
(I always keep one handy)
With the amount of force needed to unjam it; You could really damage the gun by hammering on the outside of it.
This doesn't sound comforting, I just put the first 200 rounds through it and it performed flawlessly except for the thumb button on the mag release turning itself out and landing in my palm. I have two norincos, np34 and the np29 and at the moment the latter is winning me over. Only wish it was a double stack mag but then the np29 does fit like a glove.



























