The Microtech Scarab II is the biggest statement in the catalog: the largest double-action OTF Microtech currently makes, running about 9.7 inches deployed with a blade just shy of 4 inches that is also the widest in the lineup. Pushing nearly 6 ounces of contoured 6061-T6 aluminum, it was conceived to embody the best of each Microtech knife style in one oversized platform.
If the Ultratech is the everyday face of the Microtech lineup, the Scarab II is the one you build the collection toward.
Gen III is where the platform earned its current reputation. The double-spring Dual Fuel drivetrain fires the blade with enough force that Microtech says it deploys even underwater, and the milled crud cutter grooves in the thumb slide cutout break up lint and grit before they can slow the action. Rear porting in the frame gives debris somewhere to go, 3M textured inserts keep the chamfered handle planted in wet or gloved hands, and a glass breaker, lanyard hole, and reversible steel clip finish it out. The Executive versions drop the grip inlays for a cleaner, smooth-sided chassis with the same internals.
Standard Gen III blades run Bohler M390MK, the M390 variant Bohler produces exclusively for Microtech, and the wide, thick blade stock makes the most of it; see how it stacks up in our comparison of every major knife steel. Configurations span the S/E drop point, T/E tanto, D/E dagger, and D/E-S, in plain, partially serrated, and fully serrated edges. Beyond tactical black, the catalog stretches through OD green, red, blue, turquoise, and natural clear into Signature Series runs like Plague Outbreak, a samurai motif with a hamon-style blade, weathered finishes, and burnt bronze and moss green Cerakote, up to Marfione Custom chisel-ground tantos.
The two heavyweights split hairs at the top of the range. The Combat Troodon is the proven duty knife with the deeper bench of signature grinds and a slightly longer 4-inch blade, while the Scarab II runs a touch longer overall with a wider, thicker blade and a beefier chassis. The difference in size is a fraction of an inch; the real question is how much knife you want in your fist. Among full-size OTF knives, few matchups are this close at the top.