A nationally representative survey of 2000 American adults shows broad support for prohibiting gun-possession on private land without the landowner’s explicit permission. Many states have laws which permit concealed weapon carry unless explicitly prohibited by the landowner, but our survey suggests statistically-significant majorities would prefer “no carry” defaults with regard to homeowners, employers, and retailers. While respondents who are Republican, male, or gun owners are more likely to support “carry” defaults, we find that the majoritarian rejection of “carry” defaults does not tend to vary by region or state. However, our survey does find majority support for a default right to possess guns in rented property and on an employer’s parking lot. Respondents across all contexts also report substantial ignorance or misinformation about the law. Landowners who don’t know or mistakenly believe that concealed carry is, by default, prohibited on their land may be less able to protect themselves by explicitly prohibiting such third-party possession.