Leonardo Introduces Advanced 120mm L55 Tank Gun: A New Era in Armored Warfare

Less than a month following significant personnel changes, Leonardo has officially presented its latest advancement in artillery technology—the 120 mm L55 tank gun. This unveiling occurred at the “Cottrau” gunnery range, part of the Italian Navy’s Naval Experimentation Support Centre near La Spezia. The event showcased a six-round test firing, marking a critical milestone in the development of this cutting-edge weapon.

Strategic Focus on High-Caliber Artillery

Luca Perazzo, Deputy Managing Director of Leonardo’s Electronics Defence Business Area, emphasized the event’s purpose: to introduce the 55-caliber gun and its associated ammunition technologies, which will be elaborated upon in future publications. This project has benefited significantly from Leonardo’s substantial investment in new production machinery aimed at increasing barrel output at the La Spezia facility.

• Production Forecast:
  • Targeting an annual capacity of 800 barrels
  • Planned output: 260 barrels in 2025, up from 170 in 2024
  • Acquisition of two new autofrettaging machines to optimize production efficiency

Perazzo revealed that recent hires—totaling approximately 300, with 40% in mechanical roles—allow the facility to operate with enhanced capabilities. The breech production section’s three-shift schedule aims to align output with demand from other manufacturing divisions.

A Technological Leap in Design

The L55 project, fully funded by Leonardo, has been crafted specifically for tracked military vehicles, as the recoil forces involved render it unsuitable for wheeled platforms. Manuel D’Eusebio, Head of Mechanical Design for Land Systems and Artillery, remarked that the timeline from concept to first test firing was impressively condensed to just 18 months. This included prototype development and initial testing phases, culminating in successful firings on June 24, 2025, at a facility in Nettuno, Rome.

This new gun draws heavily from their historical experiences with predecessors like the 120 mm L44 and L45, enhancing its design to efficiently utilize new APFSDS (Armor-Piercing Fin-Stabilized Discarding Sabot) munitions that promise increased effectiveness against contemporary armored threats, including Rheinmetall’s KE2020Neo.

Key Features and Performance Enhancements

While the 120 mm L55 represents a distinct class of weaponry due to its longer barrel and associated modifications, it still retains underlying principles from its design forebears. Among the notable enhancements:

• Rethought Design Aspects:
  • Reinforced breech block and recoil brake/recuperator assembly
  • Adoption of advanced simulation systems to reduce development time through meticulous firing condition modeling

Revised hydraulic components enable the gun to withstand higher recoil pressures, ensuring reliability during rapid firings. The project’s emphasis on modularity allows the L55 to integrate easily with pre-existing systems, thereby maximizing the longevity and effectiveness of current platforms.

Barrel Engineering and Lifespan

The engineering of the barrel is equally noteworthy, utilizing an advanced steel alloy similar to that of the 120 mm L45 but enhanced through an improved autofrettaging process. This innovation allows for a higher design pressure and improved performance potential, positioning the L55 as a formidable competitor in the global market for 120 mm artillery.

• Forecasted Barrel Life:
  • Approximately 1,200 rounds under standard conditions
  • Variable wear rates based on ammunition type, with APFSDS rounds typically contributing to increased degradation

The thermal sleeve design represents an evolution in materials engineering, involving composite and aluminum structures that enhance durability and thermal stability under operational stress.

Operational Implications and Future Integration

Leonardo aims to position the 120 mm L55 on various platforms, particularly focusing on the Italian Army’s Integrated Main Battle Tank (i-MBT) project. This collaboration with Rheinmetall is noteworthy for its production arrangement, where Italy will manufacture barrels for the majority of tanks, while Germany will supply others—a significant step in joint European defense initiatives.

Potential upgrades are also being considered for the Ariete main battle tank, which would involve modifying turret systems to accommodate the L55’s increased mass and performance capabilities. The focus on incorporating modern technologies like a scout variant of the AICS vehicle underscores the strategic commitment to enhancing ground combat effectiveness.

Conclusion

The 120 mm L55 artillery system signifies Leonardo’s commitment to advancing armored warfare capabilities, underpinned by an innovative approach to manufacturing and design. By leveraging historical expertise while embracing modern materials and technologies, the company is set to redefine the standards in military artillery. The initial success of the L55 not only highlights Leonardo’s engineering prowess but also its role in shaping the future landscape of land-based military operations.