The New for 2018 revampedÌ´Ì_Microtech HALO VIÌ´Ì_(High Altitude, Low Open) single action out-the-front (OTF), knife by Microtech Knives.. The HALO 6, when deployed, provides the absolute tightest lock up possible. The one handed, fast action open, has fired its way into the hands of thousands of protective agents. HALOåäÌÝå»s smooth lines, light weight, and deadly edge, provide a little more than just backup. To fire simply press the button and feel the Halo deploy with power. To retract, manually pull the charging handle back and watch the blade retract back into the handle. The press the charger back into the handle and voila!