I'm aware of the issues/problems associated with installing .410 bore tubes in a 12 gauge gun with inertia triggers - even on some guns that claim to have mechanical triggers. One of my shooting buddies plans to order some .410 bore tubes for his 20 gauge Browning O/U because he says it isn't a problem going from 20 gauge to .410 bore.
Seems reasonable, but I'm checking because it might be a path I'd take as well.
Larry