I have four of them and one has been shot a BUNCH and one of the others has been shot quite a bit. I have broken one cocking rod which Larry Del Grego promptly fixed. I've never had a problem with any of the single triggers. I do have a separate set of skeet barrels that, when purchased in 1962, did not have any extractors. The gunsmith put in Kreighoff extractors and they have worked that way ever since. One thing that's probably unique to the time period of their manufacture is that the four range from fairly early to one of the last and all five sets of barrel will interchange on any of the actions. In fact a few years ago I took a brand new set of K-80 barrels and put it on one of the trap guns with its forearm and shot it. It worked perfectly.
Johnpe