First I had heard of that and he claims Ruger could not get it to do it for them and Ruger also claimed his was the first. Still sounds like they treated him very well. fixed it free even after they could not get it to do what he has happen, and 10 business day turn around to get it back. Impressive. Up till this the only problem I have seen is a malfunction where the round ejects and a new round loads but the bolt did not get thrown back far enough to cock the action. I have seen a few examples of this. Mine has not done this no matter what ammo I try and even after I on purpose let it get VERY dirty just to see what would happen. I did use grease on the bolt from the start as I do with all autos. Hickock had this problem with his and was using oil, a lot of oil. I would look for some kind of drag in the bolt, if none found maybe the dead blow weight they had was slightly too heavy. So far that is the only problems I have seen with Glock mags. The one review did have trouble with both ETS mags, that would not fit it the rifle well. They had to be forced in. That same guy also had some trouble with the Korean drum mags. So far I have been unable to get mine to quit with any ammo but have only used Glock mags. Both G-17 and G-18.