The only problem with the 10" from scrapyard is that it does not have MOLLE/PALS attachments (at least mine doesn't.)
It's possible that by the time we all get our B-10s, Spec-ops will have a 10" sheath. That would probably be perfect, as it has attachments on the back & a pouch on the front. It has a removable liner (Kydex?) that you can easily mold to your B-10, and it has a split drop loop, which is a favorite of mine as you can see from my Rainwalker sheaths.
If you can find a Lost Mountain Iron Works (LMIW) Foot Long, grab it! They are out of business, but make some pretty awesome sheaths!