Al, do you remember the Silveria case? Pre-Heller, 9th Circuit, three-judge panel decision that went badly against us penned by "Justice" Reinhardt?
You can go find the "official" copy, or you can look at mine:
http://www.ninehundred.com/~equalccw/Silveira.pdf
The difference is interesting, because this decision was penned literally days before life completely blew up for one Michael Bellesiles, the scumbag lying author of "Arming America" that Clayton Cramer eventually detonated. The original Silveira decision cited to Bellesiles. Weeks later an amended version was filed that stripped out references directly to Bellesiles, while still leaving behind references to a symposium whose contents were all "Bellesiles fan club" crap.
So - point is, the copy on Gura's site is actually MORE likely to remain authentic (long term) than the "authentic original" that bad judges can still screw with.