Spyderco Edge Stability Death Match | M4 versus K390

Who will win?

[@quintond.7888]

That is probably the gnarliest production folder I've ever seen after the nail and now this. I can see why it's your fave. I wouldn't have to worry about bumping a staple anymore. Lol

[@GQBouncer]

I'm shocked that this video doesn't have way more views, Great Video and Comparison thanks!

[@hilltopknivesandgear8103]

Another kickass demo brother. Thanks for sharing.

[@df2dot]

I just threw my m4 in the garbage. It can't be in my house anymore.

[@bboness713]

Just got my first K390 in a BBS Paramilitary 2 and love it!

[@JDStone20]

Man, that is brutal test. Talk about a high performance edge!

[@FearNoSteel]

Seems to really prefer strength to pass

[@gravytrainoutdoors]

Great demonstration. Just a thought but I think it would be handy to link your other videos testing edge stability on brass rods in the info section?

[@pilesofpoodles4954]

Damn.. Those scooping cuts are the toughest in the game too.. Clever test ;)

[@CJ-hw4zc]

You have a lot of common sense about knives man, good video 👌

[@FearNoSteel]

Thanks

[@neroknives1828]

That k390 is ncredible.

[@natek1993]

K390 is such an amazing steel. Prolly my favorite hard use steel for the price. Awesome work as always BBB, keep it up brother ✊

[@bulbchangingmonkey]

Bet you sell a ton of those knives. I know I am getting one! Thanks BBB

[@SuperSteelSteve]

Bu....buu....buuut... SOFTER STEEL IS "TOUGHER "! Fucking thank you bro... The confusion between edge stability, strength, and toughness is redonk. Thanks again 👊👊👊

[@FearNoSteel]

It's pretty complicated. Harder steel is technically not tougher but what we want is Performance at the edge so the boost in strength is very important if the material has the stability and capacity to go harder. More alloy and higher Hardness is bad for Shock resistance/impact toughness but I'm not swinging a folder like an axe.

[@Gpknives]

I had a feeling based on your previous K390 vid that it would take the win here. Impressive stuff. Looking forward to the LW P4 and the possible mini Patada.

[@knifetimestory]

It was this video and the other one you did about M4 that made me buy one of each. I love M4 but found K390 to stay crispy longer. But there is still something about M4 I just keep coming back to. Not sure why, but I like the feel of it cutting through stuff. You now also have me seriously thinking about 4V. Thanks!!! Like I need another knife.!!!

[@inthepocket7405]

I can’t believe Spyderco doesn’t use it on more knives. I love that stuff, and the police is a good knife, but I can’t always use such a large knife. I wish I had gotten one of those Urban’s when they were around.

[@Katzbelger]

Thanks to this vid and the other one where you smack the K390 Police 4 on a cinder block. The Police 4 K390 is my next buy lol. Been going back and forth on M4 > K390 > M390 / 204P > S110V.. With M4 out of my list do you have any experience on how would M390 / 204P perform with same tip smacking & brass chomping test? :)

[@jownbey]

In my experience with a bradford guardian 4 and bm 710 in m390 its nothing special in toughness or stability. Both of those knives have lost, LOST! their tips at some point. Idk how it got so popular

[@John..18]

You've just made me want a Military, so much,, F=+k all other knives,,, my life is empty without one,,,, Great video btw,,

[@NDeemz]

Hope there's a paramilitary 2 in k390 soon

[@RubricoA.]

I think there is PM2 K390 Bento Box

[@ashmerch2558]

there is ! but they have an endura coming in K390... BladeHQ, DLT anand all other dealers have it coming for $80 less than the PM2. for that price I would buy the Endura and put Titanium or Brass scales on it.

[@jtcaruanafan4617]

good stuff!

[@macro820]

This is why I bought two of the Urban's in K390.. get the Police version one day

[@veeDubbinit2]

BBB. My man. I was hoping you'd test K390 (like your Rex45 vid) on BRASS!! Thank you. Sure beats rope tests, for analyzing the true toughness ability, for tool steels such as these. Much love from Canada. 👍🏻👏🏻✌🏻️

[@jimmycricket7946]

So what's your favorite steel is it still maxamet?? I remember when you use to get super excited about maxamet even to the point where you grew so impatient and ended up settling for the FRCP Manix LW.

[@jamielahugh8316]

But uncle randy told me M4 is better! Good video dude

[@FearNoSteel]

Good Ol' Uncle Randy! xD

[@danmichell7516]

good 1 love this confirmation

[@tonesetterfitness1261]

Ouch! It hurts so bad watching

[@Zeratsu]

jesus, Spyderco making Enduras and Endelas with K390 in mass production amounts and they have enough balls to heat treat it 65-66 hrc and it god exceptional toughness. I mean, what else do you want? Okay there's a 1 downside tho, it can't be shiny and reflective all the time, as soon as you open the box it'll start getting some patina. But I think is a fair price to pay for this ultimate steel.

[@John-xk7uo]

What do you sharpen with by hand or guided machine?

[@frozenturtlefarts1025]

I think my favorite of the versus series is the stainless steel one. S35vn surprised me.

[@cp1532]

Wow!

[@Cody73]

I recall you tested Rex 45 and it also beat M4 in this test. How would you say Rex 45 compares to K390?

[@FearNoSteel]

I like the k390 more. I like the edge character better. More aggressive when it comes up and it cuts longer. Rex 45 is no slouch, but I like k390 better.

[@zujostix]

A bit off topic, but I take it that Doble Stuff is your preferred choice of easy to carry sharpener for quick touch ups if needed

[@FearNoSteel]

Nailed it

[@cnnlt200]

He man, Watching your videos for some time now, Is k390 still your favourite steel? I'm a car mechanic and use my knives for light prying in plastic( opening dashboard parts) . Opening a lot of boxes, and cutting small diameters copper wire/ cables( wire loom). I don't care for stainless steel. And to be honest k390 seems like to be what I'm looking for right?

[@FearNoSteel]

You gotta thicken the edge for that kind of work.

[@markanthonystringfellow3923]

Big Brown Bear Brass Bar Barbarism!!! Love It B :-)))

[@FearNoSteel]

xD lol

[@ashmerch2558]

K390 is just WICKED ! a 10V class steel with alot of toughness and strength. sign me up ! can't wait for Spyderco to release an Endura in K390.... maybe someday my dream will come true and they'll do a regular production Shaman in K390... a man can dream right ?

[@jasonburns956]

Sweet looks like it would be great for a nice thin Scandi or scandivex thoughts??

[@FearNoSteel]

Hrrmmm, I might steer more towards Vanadis 8 and Vancron as the stopping point. We'll talk more about that at a later date

[@jasonburns956]

@@FearNoSteel do you have vids on either of those?

[@FearNoSteel]

@@jasonburns956 you'll have to wait my friend

[@AndresReviews]

wow

[@bp-hx9ts]

Pretty nice polish for 600 grit

[@FearNoSteel]

Parallel scratch pattern and Stropped with diamonds

[@jamesondancy2183]

I think I’ll carry my P4 today!

[@JustPorcupines]

How does K390 sharpen? I've heard it has a stubborn bur, similar to S110V or 10V. When I had a knife in S110V, I remember spending more time trying to fully remove the bur than I did actually sharpening it. Is K390 similar in that regard?

[@FearNoSteel]

HELL no. M4 is more stubborn K390 is great. It's like 65rc so that burr falls off easy.

[@JustPorcupines]

Awesome, thanks.

[@FearNoSteel]

You'll love that edge man. So far it holds that front end sharpeness longer than anything production. Custom world is a different story

[@FearNoSteel]

You'll love that edge man. So far it holds that front end sharpeness longer than anything production. Custom world is a different story

[@JustPorcupines]

Soon I'm gonna order a P4 for EDC and a Maxamet Manix LW for massive amounts of cardboard cutting. Then I'm gonna file for bankruptcy, because I've bought too many blades this year. Can't wait to try K390 for sure. You've been talking it up and making it impossible to avoid buying. I trust your input, because the steels that I have experience with, that you've described, match my own results.... unlike some other people, claiming to be experts, with zero understanding of the steel's actual performance and no idea how to properly sharpen those steels.

[@artemkanarchist]

Is there any application you’d choose M4 over k390?

[@FearNoSteel]

Availability

[@FearNoSteel]

But not anymore

[@artemkanarchist]

Big Brown Bear Thanks for the response!

[@maxguitarhero]

You should see if you can get an Urban in K390. I am curious if those Italians in Maniago give a shit about heat treatment as much as Japan.

[@FearNoSteel]

I believe the urban was softer

[@maxguitarhero]

@@FearNoSteel Honestly... even softer I feel it holds an edge nice lol. Must not be below 60-61 still. :P

[@krispybeats6615]

k390 WOOHOO :D i got the delica hehe

[@bp-hx9ts]

Did maxamet do better then the k390 when you tried it on the brass rod

[@FearNoSteel]

Didn't even think to check, should be more brittle

[@bp-hx9ts]

I was pretty sure it did well idk though

[@FearNoSteel]

@@bp-hx9ts never tested

[@FearNoSteel]

@@bp-hx9ts there is a limit, after 10v/k390 the steels get more brittle my man

[@bp-hx9ts]

Big Brown Bear ahhh you tested on aluminum not brass that’s why I got it confused I realize there is a limit but still interesting

[@bodyoftruth7766]

I wonder if Benchmade's M4 is treated better than Spyderco's?

[@FearNoSteel]

A better question is what would a custom Heat treatment look like. Too bad I'd rather use other steels

[@bodyoftruth7766]

@@FearNoSteel Me too! Pacific Northwest moisture is a rust-bomb in my pocket in the woods with m4, high price... no bueno!

[@tylerarrigoni7700]

Straight talk

[@steeltoez8345]

The Rod of Truth educates once again. I don't normally go into tard mode with my knives, I'm more of a tactical pterodactyl. I'd like to see a Sprint run of k390 on the endela model down the road tho.

[@FearNoSteel]

Rod of truth! Hahhaa

[@southerncross100]

There is no doubt knife users are spoilt for choice.

[@kgrimm5576]

That k390 is some high stability stuff, my EDC in m4 just rolls/blunts to much. Love to EDC that police, but I'd get the stink eye from the sheeple. Para3 in k390, I'm patiently waiting.

[@glockgaston2922]

B A D A S S!!!!!! HOMIE!!!

[@bp-hx9ts]

Stop beating m4 while it’s down lol

[@FearNoSteel]

No one knows enough about K390. Everyone knows M4.

[@bp-hx9ts]

Big Brown Bear yeah kidding k390 seems awesome

[@lo_que3827]

K390 or GTFO 👊