Here's what I have had, in no particular order:
mag drops from gun on firing
mag refuses to drop from gun making jam difficult to clear
failure to feed from magazine (slide closes empty)
double feed
failure to return to battery (slide able to be closed by hand)
failure to return to battery (slide hung up on take down notch)
failure to return to battery (last round in mag jumps extractor and chambers, extractor hits rim of case when slide closes)
brass ejects into shooters face
gun jams with empty case jammed into feed lips of mag
Empty brass unsuccessfully ejects and is smashed by slide
That's all I can think of off the top of my head but there probably have been a couple of other problems.
The gun has about 350 rounds through. I've probably had 2 or 3 mags full that were problem free.
I have tried factory and Wilson Combat mags and Federal American Eagle, Winchester White Box and Fiocchi FMJ ammo (230gr).
I sent the gun in and they did what they called a "reliability tune". Clearly it had some attention as most of the friction surfaces of the gun had been stripped of the factory parkerized finish and polished smooth. This seems to have eliminated the problems with mags dropping and locking up, the hang up on the take down notch and the failure to feed a cartridge from the mag entirely issue. The remaining issues persist.
I posted a pic of the brass.
The folks at Armscor have been nice. When the gun fires it's quite accurate for its size. But I'm tired of dealing with the gun at this point.