If you or someone you know is in crisis, call the National Suicide Prevention Lifeline at 1-800-273-8255 or text HOME to the Crisis Text Line at 741741. When Russell and Sharis Lewis want to unwind, they pack up their guns and drive from their home in a suburb north of St. Louis to an indoor range called the SharpShooter on the city’s south side. Russell dons big protective headphones, carefully lays out his firearms, and selects a Panzer Arms M4 12-gauge semiautomatic shotgun. He takes aim at paper targets, including one labeled “snowflakes,” and squeezes the trigger. “It’s just something abo…