Hack quality work, the person who did this has no clue or is evil? Being charitable maybe they are just a moron? The drum does not fit the lock plate. The drum appears to have some kind of washer under it. The patent breech does not fit the barrel. The plugged drum hole is idiotic. The tang was not fitted to the stock. I would bet that the chances of decent plug to barrel thread fit are about zero. IT is absolutely unsafe to fire.
Making and selling junk like this sets a person up to lose a lawsuit when the plug lobotomizes the shooter or the drum kills a bystander. Manslaughter?, Involuntary manslaughter", reckless endangerment? I am sure a lawyer would have a field day.
Sure , many of us did horrible work when were were young and learning. Selling that junk is crazy.
"Run-Forrest-Run".