I have played with one of the earlier models of the HALO. You "cock" the knife by pulling the "charging handle" to the rear out of the back of the knife, then pushing it bach home. When you release the blade it deploys from the front of the knife with a lot of energy. The guy selling them said it would punch through 1/2 inch plywood.
I would guess they are marketed towards gadget freaks, wanna-be SF types, and guys who need to punch through 1/2 inch of plywood. I personaly have no need for a knife with that kind of stored energy anywhere on my person. It was a well made knife, but for the prices they ask you can get a Strider, and have a serious tool rather than an interesting toy.
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Fortunato became immured to the sound of the trowel after a while.
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