Butler Creek also makes one with metal lips that works better for some folks. There are entirely metal mags that can be had. I forget who makes them (don't currently have a 10/22), but recall them being advertised in the pages of Small Arms Review. Check your local Barnes and Noble for a copy and peruse the ads. The all metal ones are a bit pricey - 30 or 40 bucks? - but were said to be worth it by some.