My gen II PTR32 runs 100% on Tapco waffle 20s, Hungarian Tanker 20s, Romanian steel surplus 30s and Magpuls. The Tapcos had to be filed down on the sides for an easy fit but they also needed to be filed for my WASR. I only have one but my Hungarian 30 didn't work or my Korean 20.
Seems my feed failures were rounds not coming up high enough and hitting the feed ramp, every failed round had a smashed tip and jammed the projectile into the case. Feed ramp had a sharp edge so I smoothed it out with a chainsaw file.
I grip the mag when I shoot which I've heard might cause feed issues in certain mags but the ones that didn't work for me wouldn't work even when shooting off a bipod and putting forward pressure on the mag so there's an obvious difference in feed angles here.
The mags that did work couldn't be made to fail no matter how much I moved the mag left to right or back n forth. All mags seemed to have a solid lockup with no play in any direction.
I might try filing the rear lugs on my 'bad' mags just to see if they'll work but if I were the OP I'd send my rifle back and let them try to adjust it.
I really like mine, yes it's heavy and gets hot, but it looks like it's going to be a very accurate shooter, and the more I shoot it the more I like the recoil delay.