The issue with FRN is mold cost. Last I heard they ran over $40K, and that was some time ago. I'd be surprised if inflation hasn't pushed the price even higher. So, unless an FRN version already exists, tooling up for one is only cost effective if volume sales can be reasonably expected. That's the main reason why the number of FRN handled collaboration models Spyderco has offered over the years can be counted on one hand and why a few in-house designs only came out in FRN after a version in something else allowed Spyderco to gauge the market.