I wouldn't considering a ZT 0562CF for LEO duty, way too slick of a handle and the pocket clip doesn't work with thick(er) pants. However, I would recommend with a manual flipper instead of an auto for this type of role. If you're not a fan of framelock/liner locks, their are a lot of good button lock flippers being released. I recently used the Civivi Cogent for multiple weeks in the field, where the conditions were extremely muddy and I was impressed with how the knife/lock held when very dirty.
Well, they're bladestops not thumbstuds... so can't really fault them for not operating like thumbstuds.I have the 562CF and find the thumbstuds sharp and doesn't work well...the flipper is fine. My Hinderer had the same issue, but broke in alot better and is now butter smooth.
Does protech give you a discount? Why not try a Malibu or similar button lock? Easy to deploy, play with, disengage, and comes in a wharnie bladeshape. Other companies also have button locks you can look at, such as the cormorant, that fits your bill.
I will admit, if I could carry an OTF all the time, I would. The one-handedness of it makes it so much easier sometimes. I carry a little UTX70 with me when I fish, the pointy tip, half serration side makes it extremely handy. You can't beat an OTF in this regard.
My ideal carry would be a small fixed blade and an OTF of some kind...but alas I'm in CT and can only carry autos (double edge knives as well) when I'm hunting/fishing etc.
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