Ruger's mags are by far the most reliable in the Mini. Apparently there are some cheaper aftermarket ones, but they tend to be hit-or-miss and for the money, I think the Ruger mags (about $30 a pop) are well worth it. I recently purchased a Mini 14 Tactical (standard stock, now in a Hogue stock) from CDNN for $599. It came with one 20-round mag and a 5-round mag, and I bought another 20-round at the time of ordering. All total, it came out to like $650 with shipping. I think their extra mags were $29.99 and then I paid $19 for shipping on top of all of it. Not a bad way to get into a Mini and the Tactical with the 20-round mag was cheaper than the Walmart special Ranch Rifle with the 5-Rounder.
I had Ruger replace one 20 rd mag. factory mag as it would fail to feed. I've bought 4 30 rd Tapco gen II and all 4 are flawless. I bought some Pro Mags and they're somewhat junk. But a little Dremel work and they're fine. I'll buy more Tapco's Gen IIs without hesitation. The Pro Mags? not so much. But the 20 rounders will be Ruger or nothin from now on.jmho
I am also going to say the same thing. Stay with the factory Ruger Mags no matter if it's 5,10,20,or 30 round mags. Also CNNN is really a good place to buy your mags from. They are cheaper then buying new mags from Ruger!
Tried all of them out over the weekend in both my 185-series and my 582-series Tactical. They fit in both rifles - both with bolt opened and closed - perfectly. All cycled flawlessly when firing. Had a tiny bit of trouble loading the 30-rounder at first, but got through it.
Ruger factory mags are the best, but I'm happy I got these! Good quality, great price.