Support BladeForums! Paid memberships don't see ads! M2.SO. The third letter references the blade finish whereas the fourth letter describes the scale color (black/coyote/olive). There are several letters referencing the finish including A/B/F/S. B is Black and F seems to be Flat Dark Earth. Is S for Stainless Steel (Gray)? What type of finish does A refer to? Anthracite (Black)?