i've been looking into it as well. the problem is that the catcher has to let the pump go back and keep the shell door unobstructed, and there's not alot of space forward of the ejector port to mount a universal shell catcher.
i was thinking of
this, where the velcro part goes behind the ejector port and shell door. there may be an issue with the action lock bar being blocked (thing on the trigger guard), and i don't know if it is big/small enough to fit and work on the shotty