Mini's are a bit picky about magazines, and so many aftermarket mags are low quality. PMI is the only one I know to be reliable in the Mini-14. If MecGar makes magazines for the Mini, they'd be good too. They make a lot of the factory magazines for gun manufacturers. Thermolds are supposed to be reliable, but I've never seen one so I don't know how easy they are to find. Supposedly Promag's polymer copy of the Thermold works ok as a range mag, but I haven't tried them yet. I wouldn't want to trust it for serious purposes though.