My two points on the survey are:
1) Their somewhat crowd-sourced methodology for sample set collection leaves room for people like me, in states like mine, to say, "Guns? What are those?"
2) While I do not necessarily dispute the percentage for CA (taking into account #1), raw numbers of guns create a different story. Population based vs percentage of population, but I believe the top three states for most guns are TX, CA, FL.
Still, the more valuable story would be, what states do the most to stay out of your beezwax regarding guns?