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Small armsIn service
Assault rifle (MSBS Grot C) Bullpup assault rifle (MSBS Grot B)
FB MSBS Grot is a assault rifle (MSBS Grot C) Bullpup assault rifle (MSBS Grot B) originating in Poland. It was built by FB "Łucznik" Radom. Reported operators include Poland, Rwanda, Ukraine, United States.
PolandFB MSBS Grot
Doxlulzem (photo) Sumek101 (photo editing ) · CC BY-SA 4.0 · Resized · CC BY-SA 4.0 · Source ↗ · ModifiedAssault rifle (MSBS Grot C) Bullpup assault rifle (MSBS Grot B)
Poland
See Users
Russo-Ukrainian War Russian invasion of Ukraine M23 campaign
Adam Gawron, Bartosz Stefaniak, Grzegorz Misiołek, Maciej Sajdak
2007
FB "Łucznik" Radom
2007–2017 (prototypes) 2018–present
See Variants
3.7 kg (8.2 lb) (Grot C) 3.4 kg (7.5 lb) (Grot B)
980 mm (39 in) (Grot C, stock extended) 720 mm (28 in) (Grot B)
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)
65 mm (2.6 in)
5.56×45mm NATO 7.62×39mm
Short-stroke gas piston , rotating bolt
700–900 rounds/min
890 m/s (2,900 ft/s)
500–800 m (547–875 yd)
30-round detachable 5.56×45mm NATO and 7.62×39mm STANAG box magazines , 60-round casket magazine
Integrated Picatinny rail for various optical sights and Picatinny attachable iron sights
Poland
Rwanda
Ukraine
United States
Reference text from Wikipedia contributors, used under CC BY-SA 4.0.
True scale
Sourced dimensions beside a 1.75 m human reference.
Points represent sourced observations, including revisions. Revisions on the same effective date are not separate inventory events. Ranges appear in the table and are not plotted as exact points.
| Observation / report period | Value | Source | Claim state |
|---|---|---|---|
| 28 Sept 2026 | 0.98 m | Wikipedia contributors | superseded |
| 28 Sept 2026 | 0.98 m | Wikipedia contributors | superseded |
| 28 Sept 2026 | 0.98 m | Wikipedia contributors | approved |
FB MSBS Grot equipment records. Variants, orders and quantities are shown as reported in each inventory source; coverage is incomplete.
PolandReported count for MSBS-7,62N · MSBS Grot 762N. Service scope: Polish Land Forces; does not replace a national total. 1 distinct count cell(s) from the same source list; shared rowspan cells counted once. Excludes retired/reserve/on-order rows. Count column(s): quantity: 250. Origin: Poland. The listed variants/roles are the scope, not an immediately deployable count. The components do not establish one inventory census date; the stored date is the retrieved source snapshot.
Rwanda
Ukraine
United States