GROT Modular Firearms System

Fabryka Broni / Products / Rifles and Carbines / GROT Modular Firearms System


GROT Modular Firearm System

GROT C16 FB-M1  is modular assault rifle system currently under development by the Fabryka Broni „Łucznik” – Radom. It is a state of the weapon platform with unique features.

The MSBS-5.56 is fully designed and manufactured in Poland. The modular firearms system with quick-change barrel is based on a common upper receiver for a conventional (with folding, telescopic stock) or bullpup design.

Thanks to variety of modules the conventional and bullpup design variants can be easily transformed into:

  • Assault rifle
  • Assault rifle with underbarrel grenade launcher
  • Carbine
  • Carbine with underbarrel grenade launcher
  • Designated marksman rifle
  • Light support weapon

The modular design also allows for adding further configurations in the future. A quick mission-tailored weapon down at the individual end-user level. Highly ergonomic and fully ambidextrous. The Grot assault rifle is fed by a 5.56 mm x 45 NATO intermediate cartridge, but a MSBS-7.62 battle rifle for 7.62 mm x 51 NATO rifle cartridge is also under development.


Technical data:

Cartridge: 5,56 x 45 mm NATO
Muzzle velocity: V0= 890 m/s
Muzzle energy: 1 600J
Action: gas-operated
Firing modes: single, 3-rounds burst, full auto
Rate of fire: 700÷900 strz./min.
Effective range: ~500 m
Length with stock extended/retracted: clasical  design 900/843 mm
bull-pup design 675 mm
Barrel length: 406 mm
Rifling twist rate: 6/178 mm
Sights: mechanical and optoelectronic mounted on Picatinny rail
Weapon empty: clasical design 3650 g
bull-pup design 3750 g
Magazine capacity: 30, 60 rounds


R&D Project No O ROB 0034 03 001, provided by the Military University Technology and “Łucznik” – Radom Arms Factory, founded by the National Centre Research and Development from the science founds for years 2012 – 2016.