I got this gun a few days ago. The only gripe I have with it is that the barrel is noticeably pointing up and left respective to the receiver and barrel holder (is that what it's called?).

I managed to point the barrel down to center by adding two layers of electrical tape around and under the o-ring in the breech to force the barrel to lock a little earlier while still maintaining a good air seal.
However the barrel is pointing so much to the left that it takes all of the scope windage adjustment to sight the scope. Before I added the o-ring spacers, it took more than all of the elevation adjustment to sight the scope up-down.
Is there anything I can do? It seems that the barrel is epoxied into the barrel holder crookedly from the factory.