First I have heard of the Coach Gun.
I did a quick search and the applications seem to run the gamut. I'm not in the market or I would take a deeper dive.
https://duckduckgo.com/?t=ffsb&q=Stoeger+Coach+Gun&atb=v72-1&iax=videos&ia=videos&iai=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DgA f1QWvKNRE
I have a Stoeger o/u .410 that is a great piece of gear. I bought it over 20 years ago to hunt on farm and teach my kids how to shoot.