+1Get the ones with the steel feed lips if you can. The plastic ones are okay and hold up pretty well but the steel lips model is near industructible and will outlast the others.
I have had the same experience. TI has both nylon & aluminum mags. Both function perfectly.They're of hit and miss quality.
The best hi-cap 10-22 mag has got to be the Tactical Innovations magazines. They run about 10 bucks more....but they're oh-so worth it. Besides, you can take them apart for cleaning and buy parts if they crap out. With the BCs...forget it.
I had very hit and miss experiences with the Butler Creek hot lips mags. They work great for a short while, but wear out really fast. I bought two Tactical Inc. mags and have not had a lick of trouble.
We shoot the 10-22 quite a bit. My daughter usually puts a brick through the thing every other weekend! So far...8 months of heavy shooting has not phased the Tactical Innovations mags.
- brickboy240