OKC3S USMC Bayonet Knife

This Ontario Knife Company OKC3S Marine Corps Multi-Purpose Bayonet Fighting Knife is an amazing advancement in edged weapons in general and bayonets in particular. With this bayonet, you no longer need to carry your Ka-Bar fighting knife as this bayonet serves both roles.

Out of stock


 Secure Online Payments

cc-visa  cc-mastercard  cc-amex  cc-discover

American Owned and Operated


20+ Years In Business


Returns Accepted


Ships from Pennsylvania


The OKC3S bayonet was desgined for the USMC and is a genuine current issue item. With the OKC3S you have an adaptive fighting knife that can also attach to the standard M-16 style bayonet lug. This current issue bayonet comes with a scabbard that has a ceramic coated aluminumn honing rod to sharpen the OKC3S to your desired level.

  • Adaptive Bayonet / Fighting Knife
  • Fits All M-16 Style Bayonet Lugs
  • Brown Grip, Scabbard and Webbing
  • Can Attach to Load Bearing Equipment
  • Overall Length: 13.25"
  • Blade Length: 8"
  • Width: 1 3/8"
  • Mission Serration: 1.75"
  • Blade Hardened: 53-58rc
  • Finish: Phosphate Non-Reflective
More Information
Overall Rating
Four Stars
Review by Keepshooting Customer
Blade is loose but otherwise a nice blade!
Overall Rating
Exactly as I remembered.
Review by Keepshooting Customer
I got the one that was supposed to be sharp but I found that I couldn't shave with it. I guess you have to go a bit more then I do for an honest to goodness sharp blade.
Overall Rating
Review by Keepshooting Customer
Exactly what I was looking for. Awesome! My friend collects bayonets, knives and edged weapons, I am going to gift this to him for his collection. Thanks!
Overall Rating
One of the toughest bayonets made
Review by Keepshooting Customer
Made for fighting. One of the few combat knives I have owned that is also designed for chopping, with a short enough blade that makes getting in close easy and not impractical for camping and hunting. Very strong, sturdy blade that has a little flex for stabbing, good hand guard that will break bones with impact and cut like light saber if you hit a vital point. Very well made knife with high quality coating and no edge dressing needed. Came razor sharp, so you can go out tomorrow and kill with it. Not the knife for fine cooking, fine cutting wood, wood working, a shaving/skinning knife, decorative knife, unless you want a cheaply decorated knife, etc. It will also tear a tarp, cloth etc with very little effort. If you buy a machete to use for heavy chopping/clearing brush you should consider this knife for the right situations. It is better suited for defense than chopping heavy logs, and the smaller size is a bonus for camping. For camping and hunters who don't need it for survival use, it will work better than most military knives and combat/utility fixed blades, due to it's small size for camping, ease of transport, sturdiness and all around use, and the full tang construction is strong.
Overall Rating
Excellent, Reliable Knife. A very capable blade, sturdy handle, full tang construction. Hefty, well balanced.
Review by Keepshooting Customer
I own 4 other Kabars from Ka-Bar (7-1/2", 6-1/2", Ontario 3-1/2", and the standard Army Ka-Bar) but for the same price, or a little more, the Marines' Ontario 7-1/2" Kabar has better materials and the "Full Flush Mount" capability is a major plus. I have a large slip plate mount on my Sig MPX with one of these for emergency or when attached I have full functioning controls on both sides. A really sturdy well made knife. Fit and finish are good. The butt of the knife fits my large hand comfortably and all the sturdiness is there. A serious blade.
Overall Rating
Fantastic blade for those with an appreciation for these items. Great item. Well constructed
Review by Keepshooting Customer
Bought this to mount to an Armalite Rifle in Colt M4 Carbine pattern. This fits that application very well. The original Bayonet scabbard is functional and it is worth noting that if this bayonet scabbard (which appears much older) has broken over time and caused this to have more of a curve in its original place of mounting on the original bayonet scabbard then that is likely the scabbard manufacturer's doing. But I had no issue. My Armalite was an F3 and has much more length to its grip and also a longer gas block. This allows a good fit on the original USGI Bayonet Mounts and has a nice ergonomic shape to them. The Bayonet mount was held with a threaded rod into two captive threads in the end and that has been functional with this setup. However it is very difficult to clean. But when attached, looks very good. Well worth the $100+ I paid. Recommended if you appreciate military/Bayonets/etc
Overall Rating
great for the $
Review by Keepshooting Customer
its the best under $50 blade that i have. nothing fancy, sharp as hell out of the box, with a secure fit. all its lacking is g10 handle but for $50-70 this thing will tear up anything. I love Ontario knives for being so inexpensive but still have good durability, you cant beat em for what they are
Overall Rating
Review by Keepshooting Customer
Amazing. Only way to go for a good stabbing knife. Not made to punch but great for cutting and stabbing a wall. Good for an added defense knife to you belt but don’t use it to stab. Not designed for that. For that you need something more like a “hunter” bowie.
Overall Rating
Amazing Knife! Perfect Edge and Feel
Review by Keepshooting Customer
I have purchased several tactical knives from various vendors. I own several of KA-BAR knives. I also purchased a Camillus (a knife company from New York) bayonet for use with M1 Carbine. The Okc-3S is by far the best knife I have owned. It is far better than any knife I purchased for 4x to 5x the price.
Overall Rating
Review by Keepshooting Customer
This thing is amazing. I love it and will be buying more in the future.
Write Your Own Review
You're reviewing: OKC3S USMC Bayonet Knife
Your Rating:

You submitted your review for moderation.

Customers Also Bought

Navigating through the elements of the carousel is possible using the tab key. You can skip the carousel or go straight to carousel navigation using the skip links.
East German AK-47 Bayonet
4.45 (11)
M9 Bayonet - Taiwanese
4.5 (4)
M1 Garand Bayonet
3.9 (276)
USGI M9 Bayonet - Black
4.5 (103)
M1 Garand Long Bayonet with Scabbard
5 (7)
M7 Bayonet (Chinese) for AR15
4.9 (10)