even with the marlins action strength, thats sounds like a lot of cartridge pressure to contain. Doesn't sound like a good idea to me at all. Thats why one of the first things you learn in the safety course is not to fire any ammo in a rifle that doesn't have the actual ammo the gun uses engraved on the barrel/reciever.
Looks like a facelift waiting to happen. I certainly wouldn't use it, and I think that he has been extremely lucky thus far. But, natural selection has a way of making society smarter by taking out the dumb ones.