I've done one and it works great.....but only with shooter's ridge 25 round mags. It is a butt load of work and I barely shoot it now. I have a factory ruger 10/22 magnum, I had and extra barrel for it, I already had extra magazines, and I had an old 10/22 action that was laying around, so I decided to try the conversion. It was hours of playing with all aspects of the action to get it to fire an then feed reliably. While I'm very happy with the results, if I didn't already have all the parts lying here I would have been better off to go out and buy a Magnum Research .22 mag built 10/22. For about the same $ as what the conversion would cost, you could just buy one and skip the headache.