The Mini-30 is a piece of shit.
They would be reliable with decent mags, but I am yet to see any decent high capacity magazines made for them. Ruger makes no high caps for them, at least none available to civilians. I don't even think they make any for LE. All that leaves are junk mags like USA, Triple K, etc. They are total junk and unreliable.
I have seen many cases where Mini-30's misfire because of the hard primers used on Russian ammo designed for SKS/AK rifles. So if you want reliable function, there goes your cheap ammo sources.
Mini-30's are not very accurate at all. The AK is every bit as accurate.
AK mags can be found in piles for very low prices. And unlike Mini-30 junk mags, these will work.
The Mini-30 has all the same negatives as the Mini-14, only worse. You couldn't give me one.
If you want a 7.62x39, get an AK. And if you prefer the sporter stock, get a Saiga.