Poland works on a new contract for the delivery of 18,000 MSBS GROT assault rifles to the Polish armed forces manufactured by the local firearms company FB “Łucznik” Radom. The FB MSBS Grot (Modułowy System Broni Strzeleckiej) is a modular assault rifle developed and manufactured by FB “Łucznik” Radom. There are two basic configurations of the rifle that is based on a common upper receiver; a conventional layout and a bullpup layout. With its variety of modules, both configurations can be easily configured into an assault rifle, carbine, designated marksman rifle, or squad automatic weapon. The rifle can also be chambered in 7.62×39mm cartridge.
There are two basic variants developed by Fabryka Broni “Łucznik” that is based on a common upper receiver including a conventional assault rifle and a bullpup variant. With its variety of modules, both variants can be easily transformed into an assault rifle, carbine, designated marksman rifle or light support weapon. The GROT assault rifle is an individual selective-fire, gas-operated weapon available in 5.56 and 7.62mm calibers. It is fully designed and manufactured in Poland. The modular small arms system with quick-change barrel is based on a common upper receiver for a conventional folding stock or bullpup design.
The following variants were designed based on the requests from the Polish Armed Forces to replace currently used firearms such as the AKM, FB Beryl, FB Mini-Beryl, and Pallad grenade launcher. The MSBS GROT is a selective fire modular assault rifle which is capable of semi-automatic, 3-round burst and fully automatic fire. It has a cyclic rate of fire of around 700–900 rounds per minute (RPM). Around 800 MSBS Grot R 20 FB-M1 and MSBS Grot R 20 FB-M2 are in use or on order, and around 53,000 MSBS Grot C 16 FB-M1 are on order. Some of them will be equipped with a grenade launcher.