For less than $20 plus shipping everyday people can turn their handguns into machine guns. The Trace’s Alain Stephens explains the rise of the “auto-sear.”This episode was produced by Hady Mawajdeh, edited by Matt Collette, fact-checked by Richard Sima and Laura Bullard, engineered by Paul Mounsey, and hosted by Sean RameswaramTranscript at vox.com/todayexplained  Support Today, Explained by making a financial contribution to Vox! bit.ly/givepodcastsLearn more about your ad choices. Visit podcastchoices.com/adchoices