This is Rainy's Prototype #2 for his SENSEI model. The differences include the slightly smaller size of the #2; it is not a dual action, lacking a thumbstud; and the button release on the #2, which is also flush in the scales, is anodized purple titanium and is not scalloped. Like the first prototype, the backspacer is fully fileworked as is the rear inside of the spacer. The spring is jeweled. Also like the original, the handle tapers back with contours to provide an excellent grip.