Surplus mags I did not use due to the large gap in tolerances that are allowed with surplus mags . The AK platform is designed to deal with a floppy loosing fitting mag . Roller locks can’t play that game so I don’t bother . All my surplus mags are Yugoslavian which are no go anyway. So I just use the pmag or BakeliteThread hijack. Did you have any luck with commie mags in PTR-32? Magpul AK MOE mags works well, but surplus mags are a bear to pull out. Seems that lock on the PTR does not go back far enough, and magazine lug cannot clear it.