I've been looking into this...it seems many TP's are seen with the MkIII/Cmk3 sight because with it in the rifle, the bolt can be removed without lifting the rear sight, a real pain when trying to clean a rifle and maintain zero with the scope. And, since the rear sight on the sniper would be for emergency use only anyway, the stamped sight would suffice. (especially since it was standard issue from 44 or so on anyway)