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BENSON, AZ - SEPTEMBER 29:  Gun shop owner Jeff Binkley displays AR-15 "Sport" rifles at Sarge's Sidearms on September 29, 2016 in Benson, Arizona. He said he redesigned and renamed his store just this year. Gun shops are proliferate in Arizona, which regulates and restricts weapons less than anywhere in the United States.  (Photo by John Moore/Getty Images)
BENSON, AZ - SEPTEMBER 29:  Gun shop owner Jeff Binkley displays AR-15 "Sport" rifles at Sarge's Sidearms on September 29, 2016 in Benson, Arizona. He said he redesigned and renamed his store just this year. Gun shops are proliferate in Arizona, which regulates and restricts weapons less than anywhere in the United States.  (Photo by John Moore/Getty Images)

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Modification tools 'work around' gun laws

Law enforcement sometimes encounters weapons that have been modified to be fully automatic.

Modification tools 'work around' gun laws

Law enforcement sometimes encounters weapons that have been modified to be fully automatic.