Okay, picked up a second Victory today and a little bag full of rubber o-rings to put on the take down screws of my dynamic duo. So far, no loosening during firing noted, but I'm going to do a torture test next weekend and see how they hold up. BTW, intrigued by the Ruger Mk IV, but they sure ain't giving them things away, so I think I'll just find a way to make the Victories work.