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Microtech Dirac
The Microtech Dirac moved the furniture. Every Microtech OTF before it carried the firing slide on the side of the handle; the Dirac and its big brother, the Dirac Delta, were the 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, glass breaker, and deep-carry clip, and both are machined in the USA alongside the rest of the Microtech lineup.
The Top-Mounted Firing Slide
Putting the slide on the cover does two things. 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 down the knife's axis instead of 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 identical formula to a 3.75-inch blade at 9.25 inches and about 4.6 ounces, putting it in Combat Troodon territory with a very different personality: same reach, softer curves, centerline fire. Two frames, one idea, and the choice is purely about how much knife you carry.
Dirac Blade Styles and Steel
The double-edge dagger is the model's identity, in plain, partially serrated, and fully serrated edges, with finishes running from stonewash and apocalyptic through Outbreak and Plague Signature Series, Zombie Tech, 250th Anniversary flags, and cerakotes. Blades run the Bohler M390 family on current production, with CTS-204P on earlier runs; our comparison of every major knife steel covers both. And the name is the best trivia in the catalog: it honors physicist Paul Dirac, whose Dirac delta function describes a perfect impulse, which is exactly what your thumb delivers every time this knife fires.