I seem to recall Miller telling us about a Twist barreled H Grade Lefever parts gun with a cracked barrel out beyond the forearm. He hammered the crack closed and fired the gun without the crack opening back up, without welding or brazing. I believe the test firing was done from the end of a string tied to the triggers. Of course, the barrel pressure drops considerably as you get closer to the muzzles.
But this particular gun, with a big hole right where your hand wraps around the barrels? No way. Either plug it and make it an unshootable wall hanger, or sleeve it. In this case, you would not be destroying or sleeving decent Damascus barrels. You would be destroying or sleeving junk Damascus barrels that are junk precisely because they have a big honking hole right where your fingers are at risk of severe injury.
