Re: ruger 10-22
Unfortunately that's just the way some after market 10/22 stocks are. You might be able to fix it with some sanding/dremeling. Or just use the 25 rd mags. Wear and tear might be another thing that fixes it. My 10/22 had the same issue with a tapco stock, but after lots of mag changes, it seems to release the factory 10 rd just fine.
Hope some of this helps.