Spring Assist - 'Out-The-Front' Viper 3rd Gen. OTF - Satin
$43.99
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  • Get fast with the Viper
  • 3 1/2" 4034 stainless steel blade
  • Aluminum handle
  • Closed length: 5 3/10"
  • Overall length: 8 3/4"


The Viper series of Out-The-Front spring assisted knives are the most streamlined OTF models yet! They offer a bayonet style, double edged blade, housed within a compact Aluminum case. The blade is forged using 4034 Stainless Steel.

To open, start the process by pushing the blade forward using the handle's side access, and the spring assisted technically will do the rest. Once the blade fully extends, it automatically locks into place.

To close, slide the blade downward using the side access, which will release the lock and move the blade back into the handle.

There is a safety switch on the handle, and a red dot will be visible when the safety is off. The handle also features a glass breaking spike and pocket clip.

Product Specifications:

  • 3 1/2 in. blade, 8 3/4 in. overall opened.
  • 4023 Stainless Steel blade.
  • Aluminum handle.

How are Spring Assist different from a Gravity Knife or Switchblade Knife?

Gravity or Switch Blade knives feature a button, level, or other type of switch that releases a spring pressure to automatically open the blade. On a Spring Assist knife, there is no separate button or switch. Instead, you apply pressure to part of the blade to begin the opening process. This is usually a small bump of metal which sticks out under the knife, making it fast and comfortable to use. Once you press on that part of the blade, it automatically opens and locks into place. Since the action of opening the knife is started by pressing the blade metal, instead of a button or switch, it is considered to bypass the laws which ban Switch Blade kniv


Customer Reviews | Average Rating: 4.56 out of 5
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1 - 10 of 16 Reviews (View All)
Decent! Reviewed by on Feb 14, 2018   5 out of 5

This knife is okay for what it is. Tried cutting a zip tie and it wouldn’t cut through it. Oh well!



Worth it!! Reviewed by Omar Mendoza on Sep 25, 2016   5 out of 5

The Viper came super sharp out of the box. The spring action was a little stiff at first, but after a few cycles and a touch of oil it was lightning. Fun and one handed once you get the hang of it. Can't wait to get another otf soon!!



My favorite OTF Reviewed by AJ on Dec 20, 2014   4 out of 5

The base product is impeccable. The action is fast and tight and the trigger and safety placement is fine if your hands are big enough. The pocket profile is also very satisfactory. My only criticism is the lack of a divot close to the hilt, but that is easily fixed with a round file and is more a personal preference than anything, and in no way detracts from the product.



Well Built Reviewed by Josh on Dec 12, 2014   5 out of 5

Yes the knife takes some getting used to but this thing works great. The blade flies out too fast to see and when opened it is very tight, no wiggle. Buying another!



Don't like it. Reviewed by wayne battersby on Aug 14, 2014   2 out of 5

It looked good in the photo, but the release mechanism is on the rear of the knife which makes it necessary to hold it in two hands to release the blade. The release should be on the front of the knife so you can work it with one hand. To slow to get into operation.



Great Knife for the money Reviewed by Cullen M. Crosthwaite on Aug 11, 2014   5 out of 5

Great knife for the money. Opening mechanism took a little getting used to. Really like the safety lock.



Excellent product Reviewed by Paul on Dec 29, 2013   5 out of 5

The Schrade OTF Assisted Opening Viper was an excellent purchase. Fast opening, easy closing. It does take some practice to open one handed bur once mastered, it is a very handy knife. I would recommend it to anyone.



Shave ready! Reviewed by Rich on Sep 03, 2013   5 out of 5

Super sharp and lightning fast assisted opening out of the box! My friends were extremely jealous!



easy ops Reviewed by Alan on Jul 12, 2013   5 out of 5

I've had it about a month, don't know how I ever got along without it. My older hands and stiffness make opening pocket knives a chore, but this Schrade OTF zips out at the touch of the button. Using only one hand, I can unlock, deploy and close easier than any pocket knife I have ever owned. Stays sharp, strong construction, a great pocket clip, black finish is subdued for discreet carry. May get one for an old friend suffering the golden years like me.



Great and Sharp Reviewed by Kris on Jun 18, 2013   5 out of 5

very good action and pretty sharp out the box good thing it has a safety or i would have cut myself more than i already have



1 - 10 of 16 Reviews (View All)