Cut It Out,
The KA-BAR Bk-11 has the same outline but it is thicker than the Camillus BK-11 (0.165" vs. 0.150")
The Cammie BK-11 will fit in the sheath slot but it may be a loose lateral fit.
Your call. If you are wearing it as a neck knife, be careful...Having a blade than will disengage from the sheath and flop around near critical human body parts is not advisable.
There are many people who make Kydex sheaths for the BK-11. I'm sure you will get many names.
Best Regards,
Paul Tsujimoto
Sr Eng
Prod Dev & Qual
KA-BAR Knives