From the Tenth Amendment Center:
If signed into law, SB102 would nullify a wide range of federal attacks on the right to keep and bear arms in the State of Kansas. It states, in part:
Any act, law, treaty, order, rule or regulation of the government of the United States which violates the second amendment to the constitution of the United States is null, void and unenforceable in the state of Kansas.
In conjunction with Section 6a (quoted above), the bill defines what is meant by “the second amendment to the constitution of the United States,” and it isn’t based on a decision of the supreme court.
The second amendment to the constitution of the United States reserves to the people, individually, the right to keep and bear arms as that right was understood at the time that Kansas was admitted to statehood in 1861, and the guaranty of that right is a matter of contract between the state and people of Kansas and the United States as of the time that the compact with the United States was agreed upon and adopted by Kansas in 1859 and the United States in 1861.
State and local agents would be prevented from supporting any acts or actions that are “null, void and unenforceable in the state of Kansas.” Based on this text, the state of Kansas would not be allowed to participate in any federal gun control measures that restrict the individual right to keep and bear arms as understood in 1861.
As Judge Andrew Napolitano has said recently, such widespread noncompliance can make a federal law “nearly impossible to enforce” (video here).