APS underwater assault rifle and SPP-1 (Russia)

Has no analogues in the world!!! APS underwater assault rifle (Russia). Caliber: mm MPS Action: Gas operated, rotating bolt Overall length: 823 mm (butt retracted), 615 mm (butt collapsed) Barrel length: n/a Weight: 2.4 kg less magazine; 3.4 loaded Rate of fire: 600 rounds per minute (in air) Magazine capacity: 26 rounds The APS (Avtomat Podvodnyj Spetsialnyj = Special Underwater Assault rifle) was developed during the early 1970s at TSNII