Just picked up a new G17 gen 4 , and the little flat area on the right side of the frame that has "MBS" molded in does not have MBS on this particular pistol. I only have one other gen 4 Glock (21) and it has it, and all other gen 4 Glocks Iv seen has it. Is this something common ? I assume it is, at least for all the guns that came out of that mold. Anybody else have one with the MBS missing???