A super mutant with a Chinese AK, being killed with a critical shot in the head
Chinese Assault Rifles are quite possibly a leftover from the United States' war with China, an event that triggered the Great War. This rifle is chambered in 5.56mm. It bears some visual likeness to the Russian-designed AEK-971 assault rifle, as well the AK-47, but also have some distinctive differences.
This rifle can be seen in use by the super mutants in the Washington, DC area around 2277.