or any movie fan, today is a sacred day indeed. October 21, 2015 was the day in the future to which Marty McFly (Michael J. Fox) traveled from 1985 in "Back to the Future." Technically this happened at the end of the first film, but the 2015 journey was the main focus of "Back to the Future 2" (1989), making today the official Back to the Future Day, a date that will never come again. One might not think a sci-fi comedy series would call for a lot of hardware, but there is a surprising variety of firearms throughout the three films, especially in the final installment, which takes place in the Old West version of Hill Valley, California. Let's run through the series, gun by gun.