The ADS is a Russian assault rifle specially made for combat divers. It is of a bullpup layout and is chambered in the 5.45×39mm M74 round. The ADS can adapt a suppressor and optical sights.
The 5.45mm ADS rifle
Another picture of the ADS amphibious rifle.
The ADS amphibious rifle placed underwater at Interpolitex 2013.
Another angle of the rifle placed underwater at Interpolitex 2013.
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.
APS underwater rifle with 5.66-mm cartridge
Special Operations Forces operator with an APS rifle