FB MSBS Grot
| FB MSBS Grot | |
|---|---|
Grot C16 FB-M1 (top) and Grot B16 FB-M1 (bottom) | |
| Type | Assault rifle (MSBS Grot C) Bullpup assault rifle (MSBS Grot B) |
| Place of origin | Poland |
| Service history | |
| Used by | See Users |
| Wars | |
| Production history | |
| Designer | Adam Gawron, Bartosz Stefaniak, Grzegorz Misiołek, Maciej Sajdak |
| Designed | 2007 |
| Manufacturer | FB "Łucznik" Radom |
| Produced | 2007–2017 (prototypes) 2018–present |
| Variants | See Variants |
| Specifications | |
| Mass | 3.7 kg (8.2 lb) (Grot C) 3.4 kg (7.5 lb) (Grot B) |
| Length | 980 mm (39 in) (Grot C, stock extended) 720 mm (28 in) (Grot B) |
| Barrel length | 254 mm (10.0 in) 406 mm (16.0 in) 508 mm (20.0 in) 267 mm (10.5 in) (Grot S) 368 mm (14.5 in) (Grot S) |
| Width | 65 mm (2.6 in) |
| Cartridge | 5.56×45mm NATO 7.62×39mm |
| Action | Short-stroke gas piston, rotating bolt |
| Rate of fire | 700–900 rounds/min |
| Muzzle velocity | 890 m/s (2,900 ft/s) |
| Effective firing range | 500–800 m (547–875 yd) |
| Feed system | 30-round detachable 5.56×45mm NATO and 7.62×39mm STANAG box magazines, 60-round casket magazine |
| Sights | Integrated Picatinny rail for various optical sights and Picatinny attachable iron sights |
The MSBS Grot (Polish: Modułowy System Broni Strzeleckiej „Grot”, English: Modular Firearm System "Grot") is a family of modular assault rifles developed and manufactured by FB "Łucznik" Radom. Early prototypes were known as the MSBS Radon.
The MSBS Grot was developed in two different configurations: MSBS Grot C (conventional design) and MSBS Grot B (bullpup design). Both configurations use the same locking mechanism, and the modular structure ensures interchangeability of parts and accessories. The MSBS Grot is intended to ultimately replace the FB Beryl as the Polish service rifle.
The MSBS-7.62N project began in late 2015, a designated marksman rifle variant based on the MSBS Grot, and was later designated as the Grot 762N.