Something to think about - 12 ga, 2 3/4" shells create 12,000 to 13,000 pounds per square inch chamber pressure. I don't think duct tape will help. In fact, you will probably get gangrene from the fabric in the tape being blown with that much force into your hands, arms, and face. If you survive initial contact, that is.I'm pretty sure its not a good idea. And I don't want to try it. But if need be. I'm sure it'll be a last resort. I have an Orion flare gun. It shoots 12 gauge flare bullets. And I was wondering if shooting a real 12 gauge slug or bird shot is safe enough?
A buddy of mine has some bean bag rounds. We might test is out some time this week. See how well it works.
Maybe the real 12 gauge might work if the flare gun is re enforced with duct tape or something?