Ok, yeah. The google search indexing is both higher quality and MUCH faster than the in-forum search. OP, my advice would be to do an advanced google search, set your terms (I just used "k98k" "stock" and "finish" but
with even a tiny bit of effort that could be much better refined) and restrict it to the
www.k98kforums.com domain. Maybe exclude some of the common false hits, like "G98."
Something to keep in mind is that even here people's understanding has improved and evolved over time. I found a couple of old threads from 2017 using this technique that had some pretty dubious advice in them. So do some research and some digging and double check your findings.