Just go ahead and get both.
The floating stop pin will help with adjustment as the washers wear, I think the smoothness has more to do with the pivot and oversized washers. I could be wrong though.I love the 21's and owned a CF 25 but it was very stiff even though its a bug ceramic detend. Was very hesitant to get the inkosi bc of the 25 but i can tell u that the free floating stop pin on the inkosi makes ALL THE DIFFERENCE. The inkosi is much more enjoyable to open and close vs the 21 imo. I would still prefer the grip of the 21 but smoothness of inkosi --->> now that would be a superb combo - everything same on 21 except add the ceramic lock face from inkosi. That would be the ultimate CRK for me atm.
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The floating stop pin will help with adjustment as the washers wear, I think the smoothness has more to do with the pivot and oversized washers. I could be wrong though.
The 21 does have a ceramic detent ball that the blade does ride on until it "falls" into lockup.The smoothness comes from the ceramic ball riding on the tang. You don't need to apply any grease to that area on an Inkosi. On a 21 however no matter how well lubed your washers are the lock bar riding on the tang causes the friction if not lubricated. And I agree with Thin-Slice; a 21 with the ceramic ball would be the ultimate CRK!