"Beginning Thursday, a group of students will march westward a quarter of the way across Massachusetts in the latest act of a national, youth-led campaign to save lives and change the conversation about gun violence.... The activists have two main goals. The first is to get Smith & Wesson to agree to stop manufacturing military-style weapons like the M&P 15, an AR-15-style rifle that has been used in a number of recent high-profile shootings, including in Parkland, Florida, in February, in San Bernardino, California, in 2015, and in Aurora, Colorado, in 2012. The second is for Smith & Wesson to donate $5 million to study gun violence and other crimes involving the company’s firearms."