Is it safe to shoot old iver johnson champion shotgun

Thanks to quickdtoo's warning, I was prepared and took precautions about shooting it, however if the person I got it from had shot it(he had gotten it from whoever put it together and hadn't had a chance to shoot it), or anyone else not informed and not taking precautions and just shot it normally there could have been dire consequenses. On closer inspection, I don't know if the firing pin was too long and pierced the primer, or if the shotgun pin was too big around, but the primer blew out where the firing pin hole was and blew the firing pin out of the receiver, recocking the hammer and putting a nice little scar in the scope when it ricocheted off the hammer. Ok, no big deal, I walk up to it and notice that the hammer is recocked and smoke is coming from the receiver. I took the rifle out in the hills on my brothers ranch, fastened it down to the table I use for a bench, loaded it, tied the string on the trigger and got back about 20 feet. Since I made a profit on the cash portion of the trade, I wasn't out anything on the deal, however he piqued my curiosity about the rifle so I decided to experiment. Shortly thereafter I received a message from quickdtoo telling me that the rifle wasn't safe to fire as it had been built on a shotgun frame that couldn't stand the pressure and he was deleting my post for safety reasons. Not knowing anything about Handi-rifles, I found this forum and posted about the rifle. When I picked it up, this is what it looked like:

223 Handi-rifle with a hand made forearm. A few weeks ago, I traded a muzzleloader for $200 and what I was told was a.

Is it safe to shoot old iver johnson champion shotgun