Well that's a lesson in who not to buy gen spec cases from - a fake crown sold as gen, the insert doesn't fit and the crown guards are damaged . . . Yes it fixable, but aside from the fact he shouldn't have sent it out like that, returning it to be repaired/replaced will inevitably cost you time and money - he won't pay for the shipping - at least not from you to him.
A lot of vietnam cases have badly finished inner cgs - mostly it is excess metal that was not smoothed out properly thus left with jagged edges. they just got lazy i guess. It is fixable, you can just try sanding the edge and then repolishing, not really a big deal.
thanks guys! Any idea how to remove the tube without damaging it? I have an internal spline tool but this tube doesnt seem to have any teeth on the inside...