So I got this in the mail today. Interestingly, there was a battery in it, and it powered on and the solenoid clicked. So I figured what the hell, and aired it up. No leaks and it fired, but it's very much in need of a good cleaning and rebuild. It's actually in good cosmetic shape overall with a fair bit of breach wear, but very dirty.
The barrel threads on this one are proper Impulse/Ion threads. So this makes me wonder if maybe later "Pre-Release Special Edition" came with Impulse/Ion threads, as they must have made the change at some point prior to release. Maybe someone swapped on a newer body? No idea really.