i use the oem clear 10 round mag with a trimag holder
Butler Creek with the steel lips, cheap and work great.
Eagle mags. The clear ones with metal feed lips.
By far, the best 10-22 mag on the market is the Tactical Innovations TI-25. It comes apart to clean, is fully adjustable for fit via a 4 point hex screw system. (handy if your ruger has been coated with a thick polymer coating), and is just built well. They are reasonablly priced, too.
They also make an Aluminum version, though it is a tad pricey.
http://www.tacticalinc.com/ti25-mags-c-97_351.html
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