SACRAMENTO, Calif. (AP) — An affiliate of the National Rifle Association in California is asking a federal judge to block a new law requiring background checks for people buying ammunition.

The California Rifle & Pistol Association on Monday asked U.S. District Judge Roger Benitez in San Diego to halt the checks and related restrictions on ammo sales.

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Voters approved tightening California’s already strict firearms laws in 2016. The restrictions took effect July 1.

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The gun owners’ association challenged the background checks in a lawsuit filed last year and is now seeking an injunction.

Benitez previously rejected the state’s attempt to dismiss the lawsuit.

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Earlier this year, he struck down California’s nearly two-decade-old ban on high-capacity ammunition magazines. That triggered a week-long buying frenzy before he stopped sales while the state appeals his ruling.