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Microtech Halo
Microtech built the Halo around a premise most manufacturers avoid. Where the rest of the out-the-front market chased slimmer profiles and double-action convenience, the Microtech Halo committed to a single-action platform sized without apology. The name stands for High Altitude Low Opening, the design followed the UDT into the lineup back in 1995, and at about 10.5 inches overall with a blade just under 4.4 inches, the Halo VI is one of the largest single-action OTFs in production.
How the Halo Single Action Mechanism Works
A double-action OTF splits its spring energy between firing and retracting. The Halo does not. A press of the firing button puts all of that force into driving the blade forward, and retraction is handled manually by drawing back the charging handle. You give up one-handed closing and gain a deployment that hits harder and a mechanism built for hard use. The Halo VI added dual pivoting charging handle latches that lock securely and seal the internals against debris when closed, and the Halo VII moved the platform to Bohler M390MK.
Microtech Halo Blade Steel and Construction
Halo VI production runs Bohler M390 and the Halo VII runs M390MK, powder metallurgy stainless steels that hold a working edge far longer than conventional stainless and resist corrosion well enough for humid carry. Our comparison of every major knife steel covers where they sit against the alternatives. Handles are machined from 6061-T6 aluminum with Mil-Spec anodizing, with some Marfione Custom builds moving to DLC stainless steel. Grinds cover tanto, drop point, and clip point in satin, stonewash, black, and apocalyptic finishes, with the Hellhound grind appearing on Halo VI runs and Marfione Custom Halos with star grinds, cracked ice, and mirror polish crowning the range.
Choosing a Microtech Halo Configuration
Generation matters more than finish. The Halo III and Halo IV reach this page mostly as Marfione Select and Marfione Custom builds for collectors, the Halo VI is the core production knife with the latch upgrades, and the Halo VII carries the most current hardware and steel. Most models ship with a Kydex belt sheath rather than a pocket clip, which reflects how a knife this size actually carries.
Where the Halo Fits in the Microtech Lineup
If you want the size and the manual retraction, the Halo is the Microtech platform built for both. If one-handed closing matters more, the double-action models are the better path: the Ultratech is the most practical daily option, while the Combat Troodon and Scarab II bring full-size reach with double-action convenience. Browse the full Microtech catalog, or compare platforms across OTF knives at large.
