[4] Although the Swedish Navy has been the primary user of the gun, it has been exported widely by Bofors Defence for use by the navies of Brunei, Canada, Croatia, Finland, Indonesia, Ireland, Malaysia, Mexico, Montenegro, Singapore, Thailand, and the United States.

[1] BAE Systems has also stated on their website that the current generation of the weapon, the mark 3, is simply known as the 57Mk3 internally as of 2011.

However, as jet aircraft became more prevalent in the post-war era, it was clear the gun did not have the rate of fire needed to effectively deal with these threats.

Due to the ever-improving performance of jet aircraft, a new and improved base design was needed by the late 1960s.

A second variant designated 57 mm apj 7102 was introduced in 1972 on the patrol boat HSwMS Jägaren.

[1] According to Bofors, the new servo system allowed the Mark 2 to be both accurate and agile enough for use against sea skimming anti-ship missiles and that it could put more explosives into a surface target within a thirty-second window than any naval gun with a calibre smaller than 100 mm (3.9 in).

[1] Bofors claims that with 120 ready rounds the system can sufficiently engage 1 to 2 surface targets and 4 sea skimming missiles.

[3] The Mark 2 mounting originally also had room for a gun operator, however, the compartment was too narrow for practicality and the wind-shield proved to be a source for radar-reflections, and was quickly replaced by a TV-camera.

Some of the primary changes includes: the ability to use Bofors 3P all-target programmable ammunition, the addition of a small muzzle velocity radar housed in a radome externally above the gun barrel for measuring the muzzle velocity of the departing projectiles for fire-control purposes, usually but not necessarily with the new Bofors 57 mm 3P ammunition, the ability to instantly change ammunition types by the use of a dual-feed system, another 1,000 rounds stowed in the standby rack beneath deck, as well as an improved fire control system.

[7] Ammunition for the Bofors 57 mm gun is produced by BAE Systems, Sako Limited in Finland, SME Ordnance in Malaysia and Nammo in Norway.

[3] In 2006, BAE Systems AB began to offer the Bofors 57 mm 3P all-target programmable ammunition, this allows three proximity fuzing modes as well as settings for time, impact, and armor-piercing functions.

[8] In April 2015, BAE Systems unveiled a new round for the Mk 110 in the design stage called the Mk 295 Mod 1 Ordnance for Rapid Kill of Attack Craft (ORKA), made to achieve one shot kills of surface and air threats.

[10] Northrop Grumman was awarded a contract to develop a self-guided 57 mm shell for the Mk 110 in October 2023.

It is intended for use on the LCS and the new fast Frigate, and the US Coast Guard's Legend and Heritage class cutters.