Hi undertaker,
I have an NP-40 and shot it quite a bit last year. I have had issues with it and it had to go back to Marstar once.
Fit and finish are very good, CZ parts (hogue grips) fit on it just fine.
When I got it originally I had feed problems and some other gliches. Since I have gotten it back it has been pretty good. I removed the firing pin safety (still had issues) but other than that it has been good. Good value for the money I would say. Marstar does stand behind their products.
It seems to like really hot ammo to make major power factor for IPSC.
Dezdez