At the time I saw YG2, a Muscrat pattern folding fighter was in my daily carry lineup as a backup. It was a Case Texas Lockhorn, and I miss it dearly. Once Parker bought out Case, they continued producing these under the "Parker/Imai" label.
They had identical 3.45" clip-point lockback blades. The proper opening stroke is a hard "double snap", up and down. VERY impressive when done right, and for the blade length these are hideously effective fighters. You're doing "forward and reverse grips" at once and can transition from one to the other in a heartbeat. You can fake a movement typical of forward, and then shift into something in reverse in mid-stroke.
I feel that a modern-production double-3.9" Muscrat using modern lockworks could unseat the Sifu as "king of the fighting folders"...and it would be legal for street carry in far more jurisdictions.
A Megafolder Muscrat is a bad idea because the grip would be too long; the whole idea of a Muscrat is that you go from forward to reverse without any grip shift; which one you're doing need only be known by you. You can appear to be doing one, while plotting something else entirely...the opponent is supposed to go down puzzled to the very end.
I think the Muscrat in YG2 was a folder, or was meant to be a folder but the propmaster did it up fixed because an original wasn't available or was unsafe to use at high speed. As shown opened up, it was typical of a 19th century double-folder Muscrat.
A few historical Muscrats were made up as fixed-blade on one end, folder on the other. If any makers are listening, don't do it that way; there's too many legal restrictions on fixed blades across the country.
Benchmade isn't radical enough to do this. REKAT has a whole buncha new product in the works and is a small company; only SOG has all the elements: a good lockwork, current 4" class products that could be a good blade-shape platform as-is, and a "radical" enough view to produce one. They built the PE2, but in my view a SOG Muscrat would be a far better piece.
Jim
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