Does and AR-15 shoot 556 or 223? Many AR-15 rifles shoot 5.56, but many also shoot .223. It all depends on the barrel. Some which have a .223 Wylde chamber will safely handle both. While the ...

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 ...