Nope, the 510 is a discontinued model that looks like the 511 without the oversized finger guard. The 510 also has a thinner profile sheath because of the lack of finger guard.

Shame it is not around anymore, it was very popular with bushcrafters and many take 511's and remove the finger guard to make a 510 clone from them.
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No, I am not Bear Grylls, but I stayed at a Holiday Inn Express last night and Bear was there too!