The HK G3 is a battle rifle designed and manufactured by Heckler & Koch, a German firearms company. Introduced in the 1950s, it is chambered for the 7.62×51mm NATO cartridge, making it suitable for military use. The G3 features a roller-delayed blowback operating system, which enhances its reliability and accuracy. The rifle is known for its robust construction and effective range, making it a popular choice among armed forces worldwide. Variants of the G3 have been developed, including the G3A3 and G3SG/1, which cater to different operational needs and preferences in various military contexts.