The APS underwater assault rifle is an underwater firearm designed by the Soviet Union in the early 1970s. It was adopted in 1975. Made by the Tula Arms Plant in Russia, it is exported by Rosoboronexport.

Imperial Tula Arms Plant is a Russian weapons manufacturer founded by Tsar Peter I of Russia in 1712 in Tula, Tula Oblast as Tula Arsenal. Throughout its history, it has produced weapons for the Russian state. Its name was changed from Tula Arsenal to Tula Arms Plant during the Soviet era.