Looks like amphibian has it all saved off. All I could potentially add would be fresh scans of the "AR-15 Auto Connector" instruction sheet original, given I made the one quarterbore and now amphibian have been using back in about 2002.
It's long been an open question whether serials started at 1, or at 100 or 101 - the latter of which would imply there are 100 fewer out there than previously thought, as the highest serial number I've seen has been 524. I've seen 1xx serials, but never below 100. There is at least one Atchisson original handmade example on the registry, if it still exists, and might be more from the pre-SWD days.