Microtech Dirac Delta D/E Signature OTF Knife Outbreak Deep Engraved Aluminium, Outbreak M390 by Tony Marfione (227-1OBDS)

Microtech Dirac Delta D/E Signature Outbreak Deep Engraved Aluminum, Outbreak M390 by Tony Marfione – OTF Double Action automatic knife with a double-edged blade

The Microtech Dirac Delta D/E Signature Outbreak Deep Engraved Aluminum OTF automatic knife, Outbreak M390 by Tony Marfione (227-1OBDS) is a full-size OTF double-action automatic knife featuring a double-edged Dagger blade made of Böhler M390 steel and an aluminum handle with a themed Outbreak finish. The Signature Series variant is distinguished by deep engraving on the body and a unique pattern layout, which means that individual units may vary slightly in appearance.

The Dirac Delta features the family’s signature centrally located slider, which allows the blade to be automatically extended and retracted. This placement of the control mechanism distinguishes the design from many classic OTF knives with a side slider, and the glass breaker expands the model’s functionality in emergency situations.

Böhler M390 and a flat grind

The blade is made of Böhler M390 stainless steel, valued for its high corrosion resistance, good edge retention, and properties suitable for heavily used knives. The Flat grind promotes effective cutting and maintains consistent geometry on both edges.

Dagger Double Edge and Outbreak Finish

The Dagger profile features a centrally positioned tip and two smooth Plain Edge cutting edges. The symmetrical geometry gives the blade its distinctive appearance, while the thematic Outbreak finish integrates the blade with the Handle into a cohesive Signature Series configuration.

Outbreak Deep Engraved Aluminum and Central Slider

The handle is made of 6061-T6 aluminum and features a deeply engraved Outbreak finish, which gives the surface a distinctive character, while the center slide allows for operation of the Double Action OTF mechanism without having to move your thumb to the top of the frame.

Key Features at a Glance

• Böhler M390 — stainless steel with high corrosion resistance.
• Dagger Double Edge — double-edged blade with a center-point tip.
• Flat — flat grind on both edges.
• Outbreak — themed finish on the blade and handle.
• Deep Engraved — deeply engraved body surface.
• Double Action OTF — automatic blade deployment and retraction.
• Cover-mounted thumb slide — centrally located control slide.
• Signature Series — a collector’s edition with a unique design.

Technical Data

Frequently Asked Questions

How do I care for Böhler M390 steel?

After use, clean the blade and dry it thoroughly. Despite its high corrosion resistance, do not allow moisture, salt, or corrosive substances to remain on it. Before long-term storage, you can apply a thin layer of preservative.

How do you sharpen a double-edged Dagger blade?

Each edge should be sharpened separately, maintaining the same angle on both sides. Near the central tip, it’s best to reduce pressure so as not to disrupt the symmetry of the profile.

How does the Double Action OTF mechanism work?

Sliding the central slider forward automatically extends the blade, while sliding it in the opposite direction retracts it. This single component therefore controls the entire cycle of the mechanism.

How do you clean the Dirac Delta mechanism?

The mechanism should be protected from sand, lint, and excess lubricant. It is advisable to regularly clean the blade channel and the area around the slide, using only a small amount of a lubricant designed for OTF pistols.

How to safely store an OTF knife?

Store the knife with the blade fully retracted and out of reach of unauthorized persons. Before putting it away, make sure the slide mechanism is functioning properly and that the blade channel is free of debris.

Prepared by: Specialists at Sharg® company – Your expert in EDC and cutting tools