I have two 10x mags that I can't figure out
the feed lips are trashed, I don't know how old they are, and they feed perfectly
I have one 25x that is complete junk, the day I need that slot in the 10/22 magazine organizing container, it goes to the range ... as a target. I don't know why I even still have it, except as a reminder that cheap crap is, in fact, cheap crap
All three came with my first 10/22, bought at a gun-show very used. I shouldn't complain, after I made a deal on a cash price for the gun, the old codger cheerfully stuffed a junky walmart plastic bag into my hand, containing three factory magazines (for a total of four, one was in the gun), the three Eagle mags, and 200+ rounds of CCI minimags.
Oh, and go with factory magazines first, then steel-lips, then hot-lips. The 10x factory magazines are pretty damn reliable in my guns, and the clear ones are spiffy. The only working mags that take 20 or more have been the Butler Creek steel/hot lips models, I haven't tried the new BX25 from Ruger yet.