TXFRNTLDER
They both are probably rifle scopes... the 4x12 will probably have a adjustable objective while the 3x9 doesn't. Some ML scopes are also designed with a shorter parallax...
http://www.binocularsdirect.com/Bushnell_Rifle_Scopes/dprfmzmyrgr.html
http://www.binocularsdirect.com/Bushnell_Rifle_Scopes/dprfmzmyrhl.html
I really think the Dusk and Dawn is a true rifle scope...