I totally missed a very subtle but interesting design feature when i first reviewed the the Extrema Ratio HF2. In fact I believe all previous reviewers have also missed this feature. No, it is not the safety stop pin but a small milled ledge that sits directly beneath the contact zone of the tang.
As a producer of Military knives and carrying a genuine NATO designation, products intended for military operations should carry with them built in fail safe designs, to lessen the chance of complete failure under stress. We can see this from trailer rear indicator lights to optics in periscope designs for submarines (yes I do know this from previous EUROSATORY conferences I have been at-yeah EUROSATORY, not IWA etc.LOL). So for the Extrema Ratio HF2, if the regular stop pin would fail then this ledge will prevent the knife blade from folding upwards (even if the safety pin is not inserted) because the tang would now be pressing against the back side of the liner! Very subtle, very neat design. Just look at a liner lock you own and see whether there is such a ledge milled out there. So now the liner would have to fail in a direction for which it is very strong, ie along it's edge! Now we add the safety pin, then all 3 components will be essentially failsafes against blade closure under duress.
I admit, i missed this feature and feel a little embarrassed about it! How did I notice it? Well, of course I was toying with the knife whilst typing and the rest is history! So now for all those who say this is "just a regular" liner lock, I can say now it isn't at all.
BTW none of my liner locks nor my frame locks incorporate such a ledge to catch the bottom edge of the liner. It's a simple design but adds a lot of functionality that goes unseen.
See my blog on the Extrema Ratio HF1T as well here
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