An Oregon judge handed guns rights advocates a victory Thursday and placed a new, voter-approved ban on high-capacity magazines that was intended to curtail mass shootings on hold until questions about its constitutionality can be decided.

Harney County Judge Robert Raschio released the written ruling after a lengthy court hearing earlier this week in which attorneys for gun rights groups sought a preliminary injunction to stop the narrowly passed ban on magazines of more than 10 rounds.

“That the large capacity magazine bans promote public safety is mere speculation,” Raschio wrote. “The court cannot sustain restraint on a constitutional right on mere speculation that the restriction could promote public safety.”

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With the injunction in place, all provisions of the law are effectively on hold a little more than a month after voters narrowly passed it in midterm elections. Earlier this week, Raschio extended his order blocking the law’s permit-to-purchase provision, as well as a part of Measure 114 that would prevent a gun sale until the results of a background check come back. Under current federal law, a gun sale can proceed by default if the background check takes longer than three business days — the so-called Charleston loophole, because it allowed the assailant to purchase the gun used in a 2015 South Carolina mass shooting.

Read more: AP