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Protech Runt J4 Red CA Legal Automatic Satin 154CM 4421

Model: PT-4421
Manufacturer: Protech Knives
Out of stock

Note: Automatic Knives may not be shipped outside of the United States. Additionally we cannot ship to the following states: Delaware, Hawaii, Minnesota, New Jersey, New Mexico, New York, Pennsylvania, Virginia, Washington or the District of Columbia.

Blade Length Restrictions may apply to Connecticut and Vermont.


The Protech Knives Runt J4 4421 is the newest California Legal automatic knife to join the Protech family. This is a high performance Gentleman's automatic that carries like a feather and performs like a razor while still being stout and durable enough for serious use. The Runt J4 is built with modern American materials, high tech manufacturing, advanced coil spring mechanism, and American production quality that Protech prides itself on. This variant is equipped with a satin finished, plain edge blade made from 154CM and Red Anodized aluminum handles.  

Brand new directly from Protech Knives, Made in the USA.

The Blade: The Runt J4 comes with a California Legal, sub-2" blade made of American 154CM stainless steel. 154CM provides a great balance of edge retention, corrosion resistance, and toughness making it an excellent choice for every day use. The utilitarian drop point provides a fine point that can be used for detailed cutting tasks. The blade has a stunning satin finish and plain cutting edge for great slicing performance. The blade deploys via a push button operated coil spring mechanism that is fast and smooth for easy one-handed operation.

The Handle: The robust handle is made of 6061-T6 Anodized aluminum keeping the knife compact and lightweight while providing plenty of grip for secure use. A subtle choil and tapered end make for a comfortable grip. A true Gentleman's knife that disappears in the pocket, the Runt J4 is as at home in jeans as it is in dress pants. The Runt carries securely via a single position, tip-down, right-hand, stainless steel pocket clip.


Overall Length 5.19"
Blade Length 1.91"
Sharpened Length 1.81"
Blade Thickness 0.11"
Blade Material 154CM
Blade Type Stainless
Lock Button Lock
Closed Length 3.31"
Handle Thickness 0.44"
Handle Material Aluminum
Clip Deep Carry, Stainless
Weight 2.10 oz.
Country of Manufacture United States