Though I've never owned one, my understanding is that the main problem with the Mini-30 is that it cycles great with Remington, Federal or Winchester brass cased factory loaded hunting ammo, but will not reliably feed and eject the foreign made FMJ military ammo. Whether it is the steel cases, the lacquers, the sizing, I don't know. But, for most people who want to buy a semi-auto in 7.62 Russian, it's a show stopper.
Mannyrock