Scenes from the mass shooting in an Aurora, Colorado, movie theater are horrific, but are all too familiar in the United States. Some have argued that gun control is irrelevant to mass shootings because the perpetrators are typically so determined that they will overcome any legal hurdle to acquiring firearms. However, mass murderers often use assault weapons or guns with large ammunition capacity. … One of the guns James Eagan Holmes allegedly used to shoot 70... (GunPolicy.org)