I heard the 97 was going off roster next year. However, if you just look up expiration dates in general, all of them, all brands, etc., expire the same date. It's the way the system works. What needs to be checked is if a manufacturer for some reason plans not to renew the certification. I read someplace about a 5 year date on renewals and then perhaps retest required??? but can't find anything authoritative. In any event, if that were the case, quite a few firearms might be running up against the microstamping requirement. That could be extremely bad and might well trigger serious court action. Note that there is existing case law that should, in my opinion, cause that occurrence to fall apart. "Reasonable" restrictions (in whoever's mind) can not include a complete restriction of the ability to exercise a constitutional right.