Looks like an early 99K1/2 model (small ¾" tension discs) to me. Only parts that are getting hard to find is the check spring, there is no 3rd party making these springs either as of yet and don't expect them to be either as just not enough of a market for these early 99's left out there. I own/use one and personally wouldn't pass another one up :thumbsup:
ps: not at that price though