Three years after voters narrowly approved gun control Measure 114 , the Oregon Supreme Court on Thursday will hear arguments on whether its regulations are constitutional under state law.

A lawyer for two Harney County gun owners who challenged the regulations will ask the court to overturn an appellate court’s ruling that found the measure constitutional.

The measure limits gun magazine capacity to 10 or fewer rounds, requires a permit to buy a gun and closes what’s called the Charleston Loophole, which requires the completion, not just initiation, of a background check before someone can transfer a firearm.

Attorney Tony Aiello Jr., who represents the gun owners, argues that Measure 114 “degrades” Oregonian’s state constitutional right to bear arms by turning gun ownership

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