FB MSBS Grot
| MSBS Grot | |
|---|---|
MSBS Grot C16 FB-M1 | |
| Type | Assault rifle (MSBS Grot C) Bullpup assault rifle (MSBS Grot B) |
| Place of origin | Poland |
| Service history | |
| Used by | See Users |
| Wars | Russian invasion of Ukraine M23 campaign |
| Production history | |
| Designer | Adam Gawron, Bartosz Stefaniak, Grzegorz Misiołek, Maciej Sajdak |
| Designed | 2007 |
| Manufacturer | FB 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 | 870 m/s (2,900 ft/s) |
| Effective firing range | 500–800 m (547–875 yd) |
| Feed system | 30-round detachable 5.56×45mm STANAG NATO magazines, 60-round casket magazine 30-round 7.62x39mm STANAG magazine |
| Sights | Integrated Picatinny rail for various optical sights and Picatinny attachable iron sights |
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The MSBS Grot (Polish: Modułowy System Broni Strzeleckiej „Grot”, English: Modular Firearm System "Grot") is a family of modular rifles developed and manufactured by FB Radom. Early prototypes were known as the MSBS Radon.
There are two variants of the MSBS Grot: assault rifle (in conventional and bullpup configurations) and designated marksman rifle. Both variants use the same lock and the modular structure ensures the interchangeability of parts and accessories. The MSBS is intended to ultimately replace the FB Beryl as the Polish service rifle.