Funny you should mention the business about the guide bushing.

Already tried that, and the first draft failed after a few shots. But before it failed, it was reeeeaaally nice. That's what has kept my interest. If it had been meh, I'd have left it alone.

Problem with the sleeve is that it needs to be exceedingly thin. Basically the bolt tore off the sleeve after a few shots. Thought about sleeving the bolt, but an o-ring would be a better option if it weren't too much trouble.

Well, I'll keep mulling this over.