How you folks at kershaw determine what knife get the AO feature?

[houtex]

I see the new "little ones " that are coming out are coming with assisited opening.

My thinking is if the larger version doesn't , why the small?

And just for the record, my ZT301 had the spring removed but my ZT300 still has it.
Same with one of my ZT350s. Two have it,one don't.

 

[redfeenix]

My best guess would be since the smaller knives do not have KVT or any kind of ball bearing system, the flip would need a wrist flick deeming the knife a notch lower in ease of opening.

I do not own a ZT but I think that the 0560 has KVT which helps make knife openings smooth and easy to open.

That being said I would guess ergos would best decide if a torsion bar would be needed or not, but being the noob I am I could be wrong. I'm just going with logic.

Also,

The amount of leverage on a flipper (or as Kershaw calls it, index trigger), pivot system, handle materials, blade type etc etc...