Lansky Mikkel Willumsen Responder X9 Folding 4" Sandvik 12C27 Plain Blade, G10 Handles - LKN222


MSRP* : $53.99 | You Save* : $21.04 (39%)
Part #: LSLKN222 | Lansky Sharpeners
Earn 330 knifeREWARDS Points!


LSLKN222: Responder X9 Urban Tactical Knife

Lansky Sharpeners

The Responder X9 has been hand-crafted with amazing precision to be an exact representation of Mikkel Willumsen’s custom work. The unique and aggressive Sandvik 12C27 steel blade offers excellent cutting ability, corrosion resistance and edge retention. Mikkel’s extended thumb hole allows for one-handed opening and the deep pocket clip ensures your knife will remain out of sight and mind until you need it. Knife features a stout liner lock mechanism, nice flipping action, and very ergonomic shape. A little bit thick in the hand but that also gives you a stout feeling when using the design. The belly is positioned exactly where you need it for extreme cutting tasks, this is one amazing design at an incredible price.

Mikkel Willumsen has gained notoriety worldwide for his innovative and gritty Urban Tactical designs. Based in a repurposed factory in Copenhagen, Denmark, Mikkel has been designing and producing custom made knives for over 10 years, specializing in high quality folders and fixed blades. By bringing his talents and experience to Lansky, you can expect the functionally modern aesthetics that define his work, combined with Lansky Sharpeners’ unwavering dedication to quality.


  • Blade Length: 4"
  • Blade Steel: Sandvik 12C27 Stainless Steel
  • Overall Length: 9"
  • Handle Material: G10
  • 2 Position Pocket Clip (tip up or tip down carry)
  • Stout Liner Lock
  • Weight: 8.6 oz.
  • Made in China
Pocket Clip
Pocket Clip Includes a pocket clip for easy accessibility and a more secure carry.
G10 Handles
G10 Handles Formed in a sheet under high pressure by combining fiberglass and an epoxy resin binder. These handles are lightweight and shaped to ensure a solid grip.
Lansky Mikkel Willumsen Responder X9 Folding 4" Sandvik 12C27 Plain Blade, G10 Handlesrated 4.615 stars out of 5 (13 reviews)
4.6 out of 5 stars
5 star
4 star
3 star
2 star
1 star
Lansky Mikkel Willumsen Responder X9 Folding 4" Sandvik 12C27 Plain Blade, G10 Handles
rated 5 stars out of 5
Muldrow, Ok
Apr 23, 2020
Pros: Blade Material, Overall Quality, Handle Feel, Weight, Pocket Clip
Cons: None
Hoss of a knife
Just got this knife today, Sandvik 12C27, it's big but so are all chores at home, in the woods or while I'm out mowing. I like everything about this knife and echo all the positive things said here. I find no negative features in my opinion, robust, yes, plenty sharp, you bet and now it is clipped to my pocket, though I did reverse the pocket clip, just suits me better that way. Thanks Knifecenter for quick delivery and a fine tool.
Lansky Mikkel Willumsen Responder X9 Folding 4" Sandvik 12C27 Plain Blade, G10 Handles
rated 3 stars out of 5
Jay R
Memphis, Tn
Nov 25, 2018
Pros: Lock Ease of Use, Handle Feel, Overall Quality, None
Cons: Weight, Ease of Opening, Blade Sharpness
Behold, I Stand At the Knife and Flip
I have this in 440C. It was the first 440C blade that I purchased. I like big knives, but this one feels clunky. The centering is off, but it does not hit the liner. F&F are very good. It opens very poorly. I cannot catch the thumb stud because it is a blade stop. The flipper won't open the knife. If I use the flipper to start the opening and catch the blade stop, it actually opens rather smoothly and quickly. In the knife's defense, I have not taken it apart to clean and lube it. Lock up is good. The liner lock is easy to get out of the way when closing the knife. Between the scales, the ergos, and the jimping, the traction is excellent. I believe that I could hang on to this when covered with blood and/or axle grease. It was not terribly sharp OOTB. My main reason in purchasing this was that I wanted a 440C blade. I am not wild about this knife, but there is nothing really that made me want to send it back. I'm not sorry to have purchased it. Sadly, it sits with others in my drawer. If and when it responds wonderfully to some TLC, I can see it getting a bit of PT.
Lansky Mikkel Willumsen Responder X9 Folding 4" Sandvik 12C27 Plain Blade, G10 Handles
rated 4 stars out of 5
Aug 07, 2017
Pros: Handle Material, Handle Feel, Blade Sharpness, Pocket Clip, Ease of Opening, Weight, Lock Ease of Use, Overall Quality
Cons: Blade Sharpness, None
Great Knife to Purchase Value
Though this is a quasi fighting knife design as in it can be used defensively as a karambit, has a scull crusher end to the handle etc I was interested in having a heavy duty folder that had decent leverage xx a good chopper, and an upswept blade for impromptu skinning. So far I had fillet two halibut and one Buck. I was pleasantly surprised by how easily I was able to push through the breast plate of the buck while processing my harvest. I have noticed that the blade which came razor hair skinning sharp is a bit soft and M already seeing nicks along the edge. But it does resharpen quickly. I plan on purchasing a couple more comfortable 4" as well as 3" models for Christmas gifts. At this price I won't cry if I lose it in the field.
Read all 13.0 Reviews »


Subscribe to our Newsletter for exclusive offers!