FB MSBS Grot

The Grot is distinguished by the use of a common aluminum upper receiver that can accommodate different lower receiver groups and buttstocks. The operating system utilizes a short-stroke gas piston with a rotating bolt, ensuring high reliability in adverse environmental conditions and simplified maintenance for the operator.

The weapon features fully ambidextrous controls, including the fire selector, magazine release, and non-reciprocating charging handle. Each module is designed to be field-interchangeable, allowing for a rapid transition between the standard 16-inch barrel and shorter versions for special operations or designated marksman variants.

Although initially introduced into the Territorial Defence Forces (WOT), the Grot quickly equipped elite units and regular branches of the Polish Army, with over 100,000 units ordered by 2023. During its early years of service, the weapon received significant upgrades, culminating in the A2 version which addressed early issues regarding the robustness of certain polymer components.

The combat effectiveness of the MSBS found international verification during the 2022 Russian invasion of Ukraine, where thousands of rifles were supplied to Kyiv's forces. Reports from the frontline highlighted the rifle's excellent ergonomics and accuracy, consolidating its reputation as a modern infantry weapon capable of competing with the best Western standards.

The Grot represents the first Polish assault rifle of entirely original design, not derived from Soviet systems, since the end of the Cold War. The project's success has paved the way for a complete family of weapons, including versions in 7.62×51 mm NATO caliber and semi-automatic civilian variants for the international sporting market.

The flexibility of the MSBS platform ensures an operational longevity expected to last for decades, with continuous developments aimed at integrating advanced optoelectronic systems. The transformation of the Polish arms industry, from a licensee of foreign technologies to an exporter of technical excellence, finds its most significant architectural and technological symbol in this rifle.