Jager: Are you talking about the Marlin Model 31s (31-20s and 31-16s)? I see them every once in a while. And....while they are fairly light, most don't look safe to me (they weren't very substantial to begin with). Pretty much anything Browning had a hand in is quite solid. Not sure who did the Marlin designs.
Also, 1929 seems to be a watershed year for elimination of the inside-the-trigger safeties. The 520/620s, the Auto-5s, even the Model 10 abandoned them for the behind-the-trigger-guard option (that's when the Model 10 became the Model 29). On first examination, they don't seem very safe, but as a southpaw I can tell you that they work quite well for me. They make a gun far-more ambidextrous. No-where near as positive as a British rocker-type safety (and of-course, no wonderful interceptors), but adequate for someone who is already safety-conscious.
Mr. Brown: I think ring-bulging with steel is by-in-far the greatest risk. I fear that far-more than swaging out a choke. I watch the tubes on this 10 very closely...
