Paul Ryan

This Feb. 1, 2013, file photo shows a "bump stock" next to a disassembled .22-caliber rifle at North Raleigh Guns in Raleigh, N.C. A similar device was used by the gunman in Las Vegas who killed 58 people
Allen Breed / Associated Press

Rep. Peter Welch says he's disappointed that House Speaker Paul Ryan has decided not to pursue legislation that would ban the devices used in the Las Vegas shootings that allow semi automatic rifles to function more as automatic weapons.