The Colorado suspect allegedly used an AR-15-style pistol. Here’s how it differs from an AR-15-style rifle
The 21-year-old suspect in Monday’s massacre at a Boulder, Colorado, supermarket allegedly used a Ruger AR-556 pistol — what one expert called “a semiautomatic made for combat” that is easy to carry and has “the firepower of a long gun.” Ahmad Al Aliwi Alissa purchased the weapon six days before the shootings in which 10
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