MONTROSE, Colorado — Keith Carey is a gunsmith in Montrose, a town with a frontier flavor set amid the rocky mesas of western Colorado. He’s a staunch, though soft-spoken, defender of the right to bear arms. Yet now he’s also a willing recruit in a fledgling effort to see if the gun community itself — sellers and owners of firearms, operators of shooting ranges — can help Colorado and a swath of other Western states reduce their highest-in-the-nation suicide rates. “Suicide is a tragedy no matter how it’s done,” said Carey, whose adult daughter killed herself with a mix of alcohol and antidepressants a few years ago on the East Coast.