I bought a used .22 Magnum auto mag ( AMT ) off the internet and did not have time to check it out right away. Lesson learned! It appears to be in good shape however it have never fired more than one round without assistance after the fact. 80% or the time, the case is still in the chamber and 20% of the time it is caught in the action. As I did with my first AMT, I only use Winchester ammo as they suggested from the factory. I have written to High Standard who now produce these and never recieved any communication. So, does anyone have any idea what is causing the problem. I have cleaned this thing until there is nothing left, I think. It would appear to me more of a problem of not grabbing the case with the extractor but everything appears to be fine. Thank you for any advice.