So I sent my Sub2000 in for repair and got it back a few weeks ago. I was experiencing jams FTF, FTE etc prior to the repair with Glock factory 33 round mags as well as the Korean 33 round mags. The issues were random. After the repair I picked up 3 Glock 17 factory 17 round mags and they all work flawlessly. I also ran a Korean 33 rounder fully loaded and half loaded no issues. I am still having a few FTF and FTEs only when using my 2 Glock factory 33 round mags even after the repair. At this point I'm happy that my Korean 33 rounders work and my factory Glock 17 rounders work, but I'm not sure why I have issues with the 2 Glock factory 33 round magazines. I know that these two 33 round Glock mags work fine because I have used them several times without any issues with my Glock 19. Does anyone have any idea why this is happening with the factory 33 rounders? I am using 115 gr FMJ federal from Walmart.