USN MK3 MOD 0 Combat Knife damaged by sheath | Knife reviews by Ice 

I was issued this weapon when I was in the Navy during the early 70's. The retention insert can be removed, I have done it a couple of times but the blade is NOT dulled by the retention spring. The flats of the blade are the only part that comes into contact with the retention spring. The retention insert can be removed without damaging either the spring or the plastic sheath. My blade has been dulled through use, not the retention insert.

This knife fits remarkably well in the Secure-Ex sheath, that is included with the Cold Steel Leatherneck. For about $15, the Leatherneck can be given a very good home in a standard Kabar leather sheath.

I got my USN Mk3 from my father he got it from when he was in the navy and he gave it to me before he passed away its a great knife but i am wondering what makes you think the sheath is what is dulling the blade because the steel insert on the sheath only touches the flat of the blade there is no steel touching the blade edge its like if you have a piece of paper and you put the tip of the blade in the middle of the paper and fold it up leaving the blade edge where the opening of the paper is but you can take the metal insert out to adjust the tension that hold the knife in by using a flathead screwdriver and lifting the tip of the insert and you can see when its out that no metal has contact with the blade edge.i hope this was helpful, i like your videos hope you have more knife vids coming out id like to see more

I hate seeing knives that have been ruined by poor attempts at sharpening. Fortunately, I learned how to sharpen knives, from an early age, because of using knives at work. These days I even re-sharpen disposable blades and scalpels (for artwork, not surgery ;-) ), with the use of a worn-down, and relatively smooth, diamond honing steel.

I'm glad somebody has done a video on this. I have a fix. Yes, the spring steel insert can be pulled. Trim off one of the long fingers that provide the friction. It is skinny enough to fit through the oval hole near the sheath label. By putting three bends in the finger it will do its old job and be secured to the sheath. The first two bends get it over the thickness of the sheath and the last bend into the hole secures it. No more dulling the edge. No sharp protrusions either. Because the spring steel is harder than the blade this design must be a known flaw. That or the American Navy all have dull knives... hmmmm.... in this day and age I wouldn't put it past them. Possibly that little bit of spring steel is actually the useful part of the knife. Opening door latches in the middle of the night no doubt but possibly doing surgery to save somebody's life too. Design flaw or designed in flaw?

Love the knife - hate the sheath. The blade has to pass over a steel insert in the sheath. But, if you're not diving a Buck 119 sheath fits perfectly.

These knives were originally designed for UDT/SEAL teams. It got a lot of use in the early 60's. They were issued mainly for BUDS and then whenever the graduates went to their next assignment they would choose their own knives. It was meant to be a multi function tool. The saw top, the heavy pommel, and the thick blade for pry work. It's made of SS and is more of a memorable piece now than a functional one.

Superrr!!!

How much does it worth?

is it possible to remove the steel part in the sheat ?

Great for shucking oysters.