The HK416 is a gas-operated, selective-fire assault rifle designed and manufactured by Heckler & Koch, a German firearms company. It was developed in the early 2000s and is known for its reliability and accuracy. The rifle uses a short-stroke gas piston system, which helps reduce recoil and improve performance in various conditions. The HK416 has been adopted by several military and law enforcement agencies worldwide, including the United States Army and Navy SEALs. It is available in different calibers, with the most common being 5.56×45mm NATO. The rifle features a modular design, allowing for customization with various accessories and attachments.