But, once they got it down (after the sale) it turns out that the stock is busted and missing a chunk, and the barrel band is missing. I'm pretty sure I can read some of Candyman's posts and figure out how to fix the stock

But where do I find a barrel band?
It looks like the metal parts are aluminium, and they are 2x normal size. I have not found much on these online, but according to this site, http://www.billricca.com/trainers_2x.htm, they originally came with spare parts, so maybe someone somewhere out there has an extra barrel band they'd sell me? Anyone have any ideas where to look for such a thing?
the lighting is not great in there, sorry about the blurriness of the pics.