You haven't told us who is the manufacturer of your rifle. If it is a CVA, then it is likely that the drum is threaded into the breech plug. The drum would have to be removed to pull the breech plug. Due to the extreme difficulty in realigning the breech plug and drum, I don't recommend doing that unless you are a journeyman tool maker.Tried the air compressor to no avail. Also tried unscrewing the breech plug but id did not budge. I assume it's welded or loctited. I'll try shooting it. Won't this be fun!