Singleside, you know how big of a mini-14 fan I am. So I decided to get a mini-30 to shoot up all this 7.62x39 I have piled up. I must say it was the most dissapointing thing I've done for as long as I can remember! I tried 18 different mags (some were the same type) and the only ones that would even come close to functioning was the John Mason 10 rd,and that 30-45rd expandable thermold. And those 30-45rd thermolds are more scarce than chicken lips and 4x as expensive!Call me strange,but if my semi-auto gun can't hold more than 10rds,(the thermolds are too expensive to keep in quantity) I don't want it.But remember,this is only my experience,and other people seem to have more luck with it. It was the mags,not the gun that was the problem,most of them were verey shoddy constructed,feed lips not the same height,flimsy tack welds,poor fitting followers,etc....
Thanks lcm, that's what I was looking for.