 Its Chief Operating Officer is Donald Hall.When eBay changed its policies to prohibit the auction of firearms and firearm parts (such as barrels, magazines and trigger assemblies, essentially any part involved in the firing of a gun), thousands of gun and part auctions migrated to GunBroker.com.In 2008, Hitwise, a Web site measurement service, ranked GunBroker.com third in the United States' “Shopping and Classifieds—Auctions” category, exceeded only by eBay and eBay Motors.