Recent deadly mass shootings in the U.S. have at least one thing in common: the AR-15. The weapon was discovered again at the scene of Sunday's deadly shooting at a Tennessee Waffle House. This weapon has become increasingly popular in the US, since the 1994 federal weapons ban expired in 2004. Suspect Travis Reinking remains on the run. Reinking moved to Nashville from Illinois in fall 2017 and worked in construction. This wasn't his first run in with the law. In July, he breached a White House security barrier with a specific request to to meet with US President Donald Trump.