Enforcing Ban on Bump Stocks Will Be Challenging Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email In this Oct. 4, 2017 file photo, a little-known device called a "bump stock" is attached to a semi-automatic rifle at the Gun Vault store and shooting range in South Jordan, Utah. ( AP Photo ) Produced by Isabel Angell Hosted by Tanzina Vega Produced by GBH, PRX and WNYC Studios