Gunmaker Smith & Wesson (NASDAQ: SWHC) has rallied more than 70% over the past 12 months, as concerns about tighter gun control laws sparked higher firearm sales. The number of NICS background checks for firearm purchases has risen annually for 15 straight months, and year-to-date checks through July have already hit 16.03 million — indicating that total checks for 2016 should surpass the 21.14 million checks in 2015.