The strike bezel appears to be a stock E2D bezel, at least both of mine look exactly like that one. The head has been changed to an LED type head, and the color just looks to be a black and white photo which makes it look different. The bezels are interchangeable between the incandescent and led heads, so you could build one just like it if you wanted to.
You can't buy one.
Don (McGizmo) made it.
(His photo of it comes from PK-E http://www.pk-e.com/McGizmo/mods/L4D-2.jpg )
I don't recall there being a E2d in HA (rather than Black HA) so the body is either a proto-type / special, or the laser etching has been photoshopped. The Strike Bezel ring was likely taken from an original L2-PP Porcupine and simply swapped for the ring of a KL4.
You can purchase a KL4 in Black HA (it's used by the ScoutLight) and then swap the bezel rings with a standard E2d to make your own "L4D" (I guess it would be called).