A man who came under fire during the deadly assault on a suburban Kansas City JCC joined a lawsuit against a state law that makes it a felony for federal officials to enforce certain gun laws.

Paul Temme joined the lawsuit filed Wednesday by the Brady Campaign to Prevent Gun Violence fighting, KCTV 5 News reported.

Temme told the news station that he fears the law passed last year, which exempts from federal law guns bought and kept in Kansas, would facilitate the purchase of hard-to-trace weapons.

“Those weapons will not have serial numbers,” he said. “They will be permitted to be sold to dangerous individuals, potentially, and immature individuals.”

The law and others like it in a handful of states have not been tested in courts.

Temme dove to the ground when an assailant opened fire at the JCC in Overland Park, Kan., on the eve of Passover in April.

A man and his grandson were killed in the shooting. Shortly after, the same alleged assailant killed a woman at a Jewish home for the elderly.