BOISE – Arthur Michael Rhyne, a/k/a Arthur Michael O’Neil, 41, of Twin Falls, was sentenced to 7 years in federal prison for unlawful possession of firearms, U.S. Attorney Josh Hurwit announced today. According to court records, in August 2023, special agents with the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF) began investigating Rhyne for illegally obtaining and shipping firearms.  Agents learned that Rhyne attempted to ship a loaded Glock 9mm pistol with a machinegun conversion device, called a “switch,” installed on the Glock.  A machinegun conversion device is a device that, when integrated with a semiautomatic firearm, will convert it to fire in fully automatic capacity.  This conversion of a Glock pistol with a “switch” machinegun conversion device, for example, will result in a rate-of-fire of approximately 1,100 – 1,200 rounds per minute, making these devices particularly lethal.