FB MSBS-B
«Grot B16 (Bezkolbowy)»
Assault riflePoland2017Limited
Bullpup configuration of the MSBS Grot platform. Reduced overall length with the same barrel — ideal for vehicle crews and urban operations.
Assault rifle//Poland
ID — MSBS-B
Designation
FB MSBS-B
Fabryka Broni Łucznik-Radom
Caliber
5.56×45 mm NATO
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Data trust
- Reliability
- Unverified
- Sources
- Sources pending review
Identity
- Designation
- FB MSBS-B
- Alias
- Grot B16 (Bezkolbowy)
- Manufacturer
- Fabryka Broni Łucznik-Radom
- Country
- Poland
- Year
- 2017
- Category
- Assault rifle
- Status
- Limited
Ballistics
- Caliber
- 5.56×45 mm NATO
- Muzzle velocity
- 920 m/s
- Rate of fire
- ~700 rpm
- Effective range
- 500 m
- Maximum range
- 800 m
Dimensions
- Barrel length
- 406 mm
- Overall length
- 730 / 730 mm
- Empty weight
- 3.55 kg
Mechanics
- Operating system
- Gas-operated, short-stroke piston
- Bolt / action
- Rotating bolt
Feed
- System
- STANAG magazine
- Standard capacity
- 30 rounds
Fire modes
SafeSemi-autoAuto
Historical profile
Bullpup variant of the MSBS programme, developed in parallel to the classic version to offer compactness without sacrificing barrel length.
Shares the upper receiver and bolt group with the Grot C16, swappable by the operator in armory.
Adopted in limited numbers by armored units and special forces for specific roles where compactness is a priority.
Variants
MSBS-B standard
Main users
Poland
Key components
- ●Stock — Shoulder rest.
- ●Receiver — Weapon body with internal mechanisms.
- ●Grip — Primary grip.
- ●Magazine — Cartridge feed.
- ●Barrel — Guides the projectile.
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