Trump rally shooter Thomas Matthew Crooks appears to have acted as a lone wolf using an AR-style rifle that was purchased by his father, according to FBI officials. In a call with reporters Sunday ...

Too long to be easily concealed like a handgun and too short to really be a rifle, the firearm purchased by a 21-year-old Arvada man days before police say he went on a killing rampage in a Boulder ...

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Six days before opening fire in a Colorado grocery store and killing 10 people, a 21-year-old suspect in the massacre bought a Ruger AR-556 pistol - a weapon with a controversial history in the ...

The 5.56 designated marksman rifle is often an accurized M16 equipped with an optic. These rifles have changed through time, and the most well-known is the Mk 12. One of the big advantages of the 5.56 ...