(Portland, OR) -- A federal lawsuit has been filed against Oregon's voter-approved measure to increase controls on gun purchases. The measure requires gun buyers to pass a background check, take an in-person training course, and get a permit. The measure also bans gun magazines with more than 10 rounds. The Oregon Firearms Federation and Sherman County Sheriff Brad Lohrey filed the suit on Friday. It claims the measure violates the constitution. The new law is set to take effect on December 8th.