 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. (April 2014) |
| APS | |
|---|---|
 APS underwater rifle with 5.66-mm cartridge | |
| Type | Underwater Assault rifle |
| Place of origin | Soviet Union |
| Service history | |
| In service | 1975–present |
| Production history | |
| Designer | Vladimir Simonov |
| Designed | 1970s |
| Manufacturer | Tula Arms Plant, TsNIITochMash |
| Produced | 1975–present[1] |
| Specifications | |
| Mass | 3.0 kg empty 3.9 kg loaded |
| Length | 840 mm with stock extended 620 mm with stock retracted |
| Barrel length | 300 mm |
| Width | 65 mm |
| Cartridge | 5.66×39mm MPS with 5.66×120mm steel darts and tracer MPST |
| Caliber | 5.66mm |
| Action | Gas actuated |
| Rate of fire | 600 rounds per minute (on land) |
| Muzzle velocity | 340–360 meter per second (on land) |
| Effective firing range | 30 m at depth 5 m (98 ft at depth 16 ft) 20 m at depth 20 m (66 ft at depth 66 ft) 11 m at depth 40 m (36 ft at depth 131 ft) |
| Maximum firing range | 100 m in the air |
| Feed system | 26-round detachable Magazine |
The APS underwater assault rifle (Russian: Автомат Подводный Специальный, romanized: Avtomat Podvodny Spetsialnyy, lit. 'Special 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 (Тульский Оружейный Завод, Tul'skiy Oruzheynyy Zavod) in Russia, it is exported by Rosoboronexport.
Under water, ordinary bullets are inaccurate and have a very short range. The APS fires a 120-millimetre-long (4.7 in), 5.66 mm calibre steel bolt specially designed for this weapon. Its magazine holds 26 rounds. The APS's barrel is not rifled; the fired projectile is kept in line by hydrodynamic effects; as a result, the APS is somewhat inaccurate when fired out of water.
The APS has a longer range and more penetrating power than spearguns. This is useful in such situations such as shooting an opposing diver through a reinforced dry suit, a protective helmet (whether air-holding or not), thick tough parts of breathing sets and their harnesses, and the plastic casings and transparent covers of some small underwater vehicles.
The APS is more powerful than a pistol, but is bulkier, heavier and takes longer to aim, particularly swinging its long barrel and large flat magazine sideways through water.