Editorial: Troubling reversal on machine gun conversion device

In the wake of a wide-ranging gun-control law signed by Gov. Maura Healey last July, opponents of that legislation collected the required number of signatures to suspend the law until voters could decide its fate through a referendum. But Healey removed that option by signing an emergency preamble, which immediately enacted the law’s updated restrictions. Among its measures, the law’s language changed the definition of “machine gun” to include bump stocks — a device that increases the rate of a weapon’s fire by using its recoil energy to make the trigger fire...