I think your best bet of getting money is to ship with the USPS. UPS is almost impossible, with FedX only slightly better. DHL is better than the other 2. But USPS is the best I have found at shipping things anywhere in the world and having a good chance of it actually arriving, being on time, and being in pretty much the same condition as when you shipped it. The people I deal with at the USPS are overwhelmingly nicer, more friendly, and more knowledgable than represntatives at the other 3 shippers.
Will they give you full value? Maybe. Depends on how over the top they think it is. Very hard to make a blanket statement.
Chance of FedX or UPS giving you full price for just the barrels? From everything I have experienced in life I would say you have a solid 0% chance of getting full price. Even when they destroy entire guns they do not pay full price.
