Maybe, I can't tell for sure. They look to me like they might be a blend of the Sonoran design and the Rocky Mountain Snyper design. It looks to me that the Sonoran design was a conventional mechanical as far as the opening mechanism - they just sharpened the "back end" s.t. they got a cutting edge on the part of the blade that pushed the blade open. The Shwacker seems to be a rear opening blade - the blades get pushed down and out (like the Snyper) rather than flipping over and out (like conventional mechanicals).