Other than SKB OU's, with which I've never had problems, I haven't owned any of the guns you mentioned, Mike. Several Beretta 686's (and predecessors) and Citoris, 101's, a couple Superposeds. I did have problems with a FAIR failing to fire the 2nd barrel if I shot the top barrel first. Only OU ST issue I can recall. (And on FAIRs, DT's were an option.)