I recently purchased a new Ruger 10/22 stainless. I am having difficulty with the Butler Creek mags I purchased at Bi-Mart (plastic feed lip). I am constantly having feeding issues. I used the mags in my dad's gun and they jamb his also. The factory mag works great; no problems. My assumption is that these mags are pretty much worthless. I noticed that there is considerable slop (sliding back and forth) with the after-market mag in the gun. I hear a lot about the steal feed lip mags and that they are more reliable; however, I want to be sure whether it's the slop or the plastic lip that is causing the problems. I would appreciate any feedback on this issue and any reference to a better mag. Thanks!