Re: Is this a kingsnake?
It's definitely a Mexican Kingsnake (Lampropeltis mexicana sp.). It looks right for L. m. greeri (Greer's Mexican Kingsnake, AKA Durango Mountain Kingsnake), but without a locale you'd need someone very familiar with these to nail down the subspecies for sure. If it was sold to you as a Durango Mountain Kingsnake that's what I'd stick with.
Science. It reduces the stupid.