Extrema Ratio Vipera Stonewashed Nitrogen - 4.56" Nitrogen Stainless Steel Blade HCS Forprene Handle

The Vipera HCS Stone Washed Nitrogen is a fixed-blade knife built for survivalists, adventurers, and tactical professionals who demand reliability in unpredictable environments. It’s the outdoorsy sibling of the Total Black M390—less covert, more resilient in the field.

Specifications
Blade Steel: Nitrogen stainless steel – excellent corrosion resistance and field resharpening
Blade Length: 116 mm (4.56 in)
Blade Thickness: 4 mm (0.15 in)
Overall Length: 236 mm (9.29 in)
Weight: 95 g (3.35 oz)
Blade Grind: Full-flat grind with elongated drop-point profile
Blade Finish: Stone washed – hides wear and enhances durability
Handle Material: HCS Forprene with integrated lower guard
Sheath: ASPIS nylon MOLLE-compatible sheath
Origin: Made in Italy

Field-Ready Features
Nitrogen Steel Advantage: Offers stainlessness, reliable edge retention, and easy sharpening—even with improvised tools
Stone Washed Finish: Ideal for rugged use; conceals scratches and wear from outdoor abuse
Secure Grip: Ergonomic handle ensures control in wet, muddy, or gloved conditions
Versatile Carry: MOLLE-compatible sheath attaches to belts, packs, or tactical rigs
Featherweight Build: Under 100 g makes it perfect for EDC in wild terrain

Best For
Survival, bushcraft, prepping, camping, 4×4 off-road missions
Emergency responders and outdoor professionals
Anyone who wants a knife that’s invisible until it’s indispensable

This blade doesn’t just survive—it thrives in chaos.