AU-220М “Baikal” caliber 57-mm remote weapon station. (Picture source Topwar.ru)
Navy Recognition reports that Russia’s Burevestnik scientific-and-research Institute has developed a naval version of their 57mm Remotely Controlled Weapons Station (ROWS).
The baseline AU-220M ROWS weighs 3,650 kg (with a gun mount) (about 8000 pounds–Chuck) and is armed with a 57 mm automatic cannon and a 6P7K 7.62 mm coaxial general-purpose machinegun (GPMG). The main gun’s ammunition load comprises 80 armor-piercing (AP), high-explosive fragmentation (HE-Frag), and guided artillery (GAP) projectiles. (It is not clear if the guided projectile would work against a moving target–Chuck) The weapon produces a rate of fire of 80 rounds per minute and engages ground targets at a distance of up to 14.5 km. The GPMG carries an ammunition load of 500 7.62 mm cartridges. The module’s frontal armor provides Level 5 STANAG 4569 protection against 30 mm rounds; the station also features Level 3 STANAG 4569 all-round protection against 7.62 mm bullets. The AU-220M’s sensor suite comprises a TV camera, a thermal imager, and an independent dual-axis field-of-view stabilizer. The module is also fitted with laser rangefinders.
For comparison, our 57mm Mk 110 weighs 16,535 lbs. (7,500 kg), more than twice as much, and requires a separate, additional fire control system. The 25mm Mk38 Mod3 weighs 2,300 lbs. (1,042 kg).
The Swedish designed USN 57mm does have a higher rate of fire (220 rpm vs 80) and more rounds on the mount. Range and projectile weight are similar. Our firecontrol systems associated with the USN 57mm are certainly more sophisticated than the one included on this stand alone Russian system.
I’m guessing, but the US system probably also has higher train and elevation rates, making it a better anti-aircraft mount, but that would have little effect on its performance against surface target.
It may be used in lieu of the 30 mm/65 (1.2″) AK-630. U.S. Navy Photograph No. DN-SC-93-05853 aboard USNS Hiddensee.
I suspect we may see this mount used much like the 25mm Mk38 Mod 2/3, instead of the AK-630, 30mm Gatling gun (above), currently mounted on many small Russian Combatants (including Russian Coast Guard vessels like these) with only simple optical fire control systems. For these installations, it is primarily an anti-surface system rather than an anti-missile Close In Weapon System.
I do envy their 57mm’s Armor Piercing round. That might be useful in forcibly stopping a vessel.