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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 Halo committed to a single-action platform sized without apology. The name stands for High Altitude Low Opening, and at roughly eleven inches overall with a blade past four inches, this is the largest single-action OTF in serious production.
A double-action OTF splits its spring energy between firing and retracting. The Halo does not. All of that force drives the blade forward, and retraction is handled manually by drawing back the charging handle along the spine. You give up one-handed closing and gain a deployment that seats harder and locks tighter, with none of the blade play that plagues dual-action designs under repeated use. Lockup functions much like a button lock, with an internal cam capturing the tang at full extension. The Halo VI introduced an integrated safety in the firing button and dual pivoting charging handle latches that seal the internals against debris. The Halo VII moved to M390MK and revised the handle geometry again.
Current production runs M390 and M390MK, a powder metallurgy stainless that holds a working edge far longer than conventional stainless and resists corrosion well enough for humid carry. Our knife steel comparison guide covers where it sits against the alternatives. Handles are machined from 6061-T6 aircraft aluminum in Mil-Spec anodizing, with some configurations moving to stainless for added mass. Grinds cover tanto, drop point, clip point, and spear point in satin, stonewash, DLC, and Apocalyptic finishes.
Generation matters more than finish. Halo IV and V represent the earlier interface, with the blade notch longtime owners prefer. The Halo VI carries the safety and latch upgrades, and the Halo VII the most current hardware. Most models ship with a Kydex sheath rather than a pocket clip, which reflects how the knife actually carries.
If you want the size and the manual retraction, the Halo is the only Microtech platform offering both. If one-handed closing matters more, the double-action, front-deploying models are the better path. The Ultratech is the most practical daily option, while the Combat Troodon splits the difference. Browse the full Microtech catalog, or compare platforms across makers in OTF knives and push-button knives.
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