Numbers..
http://www.wyff4.com/article/how-often-are-guns-used-to-stop-crimes/10033021
An analysis of five years’ worth of statistic collected by the federal Bureau of Justice Statistics’ National Crime Victimization Survey puts the number of citizens who prevent crimes by using guns much lower than 2.5 million -- about 67,740 times a year, according to a Los Angeles Times report.
http://www.wyff4.com/article/how-often-are-guns-used-to-stop-crimes/10033021