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Microtech Dirac
The Microtech Dirac moved the furniture. Microtech OTFs like the Ultratech carry the firing slide on the side of the handle; the Dirac and its big brother, the Dirac Delta, were the brand's first to put it on the face, with your thumb riding the centerline of the knife. It sounds like a small change until you fire one, and then it makes complete sense.
Both sizes live in this category, sharing the same contoured chassis, internal mechanism, and glass breaker, and both are machined in the USA alongside the rest of the Microtech lineup.
The Top-Mounted Firing Slide
Putting the slide on the face does two things. Paired with the double-edge blade, it makes the knife truly ambidextrous, because there is no strong-side or weak-side face, and it changes the firing ergonomics: your thumb pushes straight along the knife's axis instead of reaching across it, which many carriers find faster and more intuitive. The smoothly contoured handle that carries it echoes Microtech's HALO design language, rounded where the tactical models are squared, and among OTF knives it remains one of the most comfortable ways to fire a blade.
Dirac vs Dirac Delta
The standard Dirac is the featherweight of the pair, a 3.1-inch double-edge dagger in a 7.25-inch package around two and a half ounces, sized for pockets that find full-size OTFs a commitment. The Dirac Delta scales the same formula to a 3.75-inch blade at 9.25 inches and about 4.55 ounces, putting it in Combat Troodon territory with a very different personality: similar reach, softer curves, centerline fire. Two frames, one idea, and the choice is purely about how much knife you carry.
Dirac Blade Styles and M390 Steel
The double-edge dagger is the model's identity, in plain, partially serrated, and fully serrated edges, with finishes running from satin, stonewash, and apocalyptic through Outbreak and Plague Signature Series, War Paint, camo, Zombie Tech, 250th Anniversary flags, and Cerakotes. Blades run Bohler M390 on current production; our comparison of every major knife steel shows where it lands. And the name is the best trivia in the catalog: it shares its name with physicist Paul Dirac, whose Dirac delta function describes a perfect impulse, which is exactly what your thumb delivers every time this knife fires.
