Building a reliable semi-automatic rifle chambered for the .17 HMR can be a challenge, but Rock River Arms seems to have ...

Loading This is a .223-caliber-sized round inside an AR-15. What makes the weapon so deadly is the speed of that bullet. It is small and light. Its cartridge holds enough propellant to send the ...

A South Boston man was arrested after allegedly running a red light on his scooter Wednesday in West Roxbury and officers later found an AR-15 camouflage assault rifle and 57 rounds of ammo in his ...