New York City’s The Rusty Guns combine bluegrass, country music and rock ‘n’ roll for wild and unbridled music. The four-piece — with Terry Jenkins on drums, Mark August on banjo, Harlan Short on bass, and Chris Cornwell on guitar and mandolin — crank out rousing songs about outlaws, bandits and lovers. Here they perform at The Chapel, a DIY space in East Williamsburg.