DENVER — The weapon used in the grocery store shooting in Boulder was a pistol, based on the arrest affidavit. For people who are not gun enthusiasts, a Ruger AR-556 likely does not resemble a handgun ...

Getting your Trinity Audio player ready... A gun used by a man suspected of shooting and killing 10 people at a Boulder King Soopers would have been illegal under the city’s assault weapon ban that ...

The AR-556 is unique in the world of ARs in being sold without sights. The weapon lacks a red dot sight or even elementary backup iron sights. It does, however, have a full-length Picatinny rail that ...

The modular nature of the AR-15 platform, which allows the same operating system to drive guns of different calibers, barrel lengths, and other special features, has recently spawned a new subclass of ...