Bear OPS Bear Song IV Butterfly Knife Blue Raindrop (4.38" Black) B-400-AIBD

MSRP: $145.00
Our Price: $89.95
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Item #BHQ-28970


  • Overall Length:9.75"
  • Blade Length:4.375"
  • Blade Material:Sandvik 14C28N
  • Hardness:58-60 RC
  • Blade Style:Clip Point
  • Blade Grind:Hollow
  • Finish:Black
  • Edge Type:Plain
  • Handle Length:5.375"
  • Handle Material:Aluminum
  • Color:Blue
  • Weight:4.40 oz.
  • Knife Type:Butterfly
  • Brand:Bear
  • Model:Bear Song IV
  • Model Number:B-400-AIBD
  • Country of Origin:USA
  • Best Use:Recreation
  • Product Type:Knife


The Bear Song IV butterfly knife is the newest collaboration between BladeRunnerS (BRS) and Bear OPS. It is a lightweight flipper that is designed to be your go-to everyday carry knife. This B-400 model features blue anodized aluminum handles with raindrop graphic overlays, stainless steel spacers and a swappable latch. The pivots have 304 bearing surfaces and phosphorus bronze washers. The black finished stainless steel clip point blade has a double tang pin design for great performance.


Customer Reviews

Write a review for this item
Very solid knife
Chris R.
This was my first balisong and I would definitely recomend this to anyone looking for a budget balisong. The tang pins did break after droping on hardwood, but after emailing bear and song the instantly replied and sent me out another pair with no questions asked. It's also one of my sharpest knives out of the box.
Pins Broke
Stephanie R.
I used this knife lightly for a few months, and one of the stopper pins snapped. Unfortunately, I was stupid and had previously voided the warranty by dulling the blade. I loved the knife while it worked, and found it great for learning to flip on.
definitely a good balisong
Vincent D.
So I have 3 bear songs IV, I was really impressed with the design and the way the blade feels and looks. It came a little stiff but it just needs to be broken in. Do not mess with screws because the first one I had tried to loctite the screw, well it already had threadlocker (blue) in it. So don't break seal because if you do then you will have to loctite again. The first one I had I reloctited it because I broke the seal and oiled it and it is smooth as ever. The reason why I didn't give it a 5 star was because one of the handles was tighter than the other and most people want it even.

PS: If you do decide to take screw out make sure your on a flat surface and you hold the opposite side which is that pivot barrel that the screw goes into because it will fall out and fitting it back in the hole is a pain.