Rat Worx MRX automatic chain driven knife

Rat Worx (Research and Testing WORX, Inc.) is known in the industry as a class II firearms manufacturer. Their focus has primarily been as an OEM manufacturer of gun parts for the IWI Tavor, Steyr AUG and others.

After spending three and half years in design, Rat Worx has released their patented automatic knife, the MRX, which is operated by a miniature roller chain driven by dual nested right and left hand extension springs.

The MRX chain driven mechanism is supported by ceramic-coated roller bearings that are suspended in a urethane matrix. That matrix is impregnated with aluminum disulfide for self-lubricating operation. This provides an ultra smooth reliable operation that was tested to 40-million cycles before testing was stopped.

The 3.650” blade is made from 154 CPM steel that is machine ground using a bull nose end mill. The plunger button lock mechanism is stainless steel and the body is currently made of 6061 aluminum.

When you pick up the MRX and fiddle with it, you’ll find that the knife has zero play anywhere. With the blade extended you can apply ample pressure side-to-side and you’ll discover there is absolutely no discernible wiggle. Despite being a production knife, it feels extremely solid and it gives you the impression of being a custom made blade. The MRX is 100% American made and features a lifetime warranty.

Rat Worx MRX automatic chain driven knife

The other feature that I love about this blade is the sterile look. There are absolutely no markings on the blade or handle. The markings are tucked away inside of the handle and are only visible with the blade open.

The overall length of the MRX knife is 8.450” and it weighs approximately 5.50 ounces.

So, what do I think of it? I freaking LOVE this knife. It stands out. It makes a bold statement. It’s ergonomic and seems to be built like a tank. There’s nothing else like it on the market.

This knife excels at a field knife. I used the knife to process some wood. Because the spine of the knife is a nice sharp 90 degree angle I was able to use the spine to scrape tinder shavings off the bark of a tree and to strike a fire steel to start a fire.

I have no doubt that this knife would serve those going down range without fail. This knife would excel at everything from opening up those tasty MRE’s, to cutting paracord, or opening ammo crates, or if need be cut clothing in the event of a first aid/trauma event.

From the Manufacturer:

“We have spent countless hours testing the durability of the MRX,” said Allen Millhouse, co-founder of Rat Worx. In one test, we opened and closed the automatic blade 418,000 times before we could get it to fail.”

Check out their testing of the MRX!