Last week, the House held hearings on gun violence, the first in eight years. In the 2018 elections, gun-reform groups outspent the N.R.A.—which appears to be in financial trouble. After years of greatly expanded gun rights, is the tide turning on gun reform? David Remnick talks with Lucy McBath, who ran for Congress as a gun reformer and won in the conservative district once represented by Newt Gingrich. We’ll hear from the reporter Mike Spies, the criminal-justice professor April Zeoli, the Navy veteran Will Mackin, and the gun-violence survivor Sarah Engle.