Knife uses screws, not rivets. Full disassembly is possible, and I imagine that a good polish on the brass pivot bushings would improve action even beyond factory. Action was a little tight from the factory, but a 1/16th of a turn on that screw seems to have smoothed it out quite a bit, with no play.
The Blur is a fine knife, and if of a good blade steel, I don't see why you would NEED to upgrade if you really like the blur. I prefer the edge profile on the Native. Thats just me. I had a blur at one point, and liked it, but lost it somewhere. ZT knives, IMO, are pumping their price a bit on name. Same with every other manufacturer, but they just don't feel like they deserve to command the price that they do. Just my opinion on it. Nice knives though if you can find a deal.
Bsmith, all the crap talk on this thread is exactly why I said what I did. Your statement is COMPLETELY fair and needs to be known, but it has absolutely nothing to do with this knife or drop specifically.