Well what's interesting is any action is susceptible to dirt/sand/grime and even blood. I remember reading one book that specifically recalled an incident that a 1911 didn't go boom because there was so much caked on blood on it. Or something to that degree. I believe it was in the book, "Flags of our Fathers" and it was talking about when they were on Iwo. And I'm pretty sure Garands too. I mean, you put enough gunk into any action, and it might stop it moving. I suppose some actions might be better than others. I don't even want to speculate as to what is the best. I've owned many different weapons systems and there are very few that I have NEVER had a jam with. And that's just on a range. I do have to say though, out of all the weapons I've owned, my Beretta M9 has been the most reliable thus far. It also has the highest round count for me.
Anyways.... I like the reising. I wish I had one. Even if they made a semi version, I'd love one.