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The program's goal was to create a 155 mm (6.1 in) calibre long-range artillery piece for the Polish Army that would serve as a division-level asset. The cannon was developed within the "Regina" research framework. As of 2019, Huta Stalowa Wola started using barrels of their own manufacture in successive production batches. As of 2016 full-rate production of 120 Krabs for the Polish Army has started with deliveries to be completed by 2024. The 2016 production batch utilized the Hanwha Defense K9 chassis with KMW+Nexter Defense Systems long gun, Rheinmetall barrel and STX Engine- MTU Friedrichshafen engine. The 2011 version used a Nexter Systems barrel and Polish UPG-NG chassis. "AHS" is not a part of the name, but Polish abbreviation of armato haubica samobieżna - gun-howitzer, self-propelled. The AHS Krab ( Polish for crab) is a 155 mm NATO-compatible self-propelled tracked gun-howitzer designed in Poland by Huta Stalowa Wola (HSW), by combining the South Korean K9 Thunder chassis with a British BAE Systems AS-90M Braveheart turret with French Nexter Systems 52-calibre long gun and Polish WB Electronics' Topaz artillery fire control system.
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