Credit
Doxlulzem (photo) Sumek101 (photo editing ) · CC BY-SA 4.0 · Resized · CC BY-SA 4.0 · Source ↗ · Modified
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BSmall arms
At a glance
FB MSBS Grotlarger figure on 0 of 1
Mk 13 riflelarger figure on 1 of 1
Counts only measures both sources give with the same scope. A larger figure is not a better system.
Measured figures
Grot B
Single sourceGrot C, stock extended
Single sourceConfiguration
| Specification | FB MSBS Grot | Mk 13 rifle |
|---|---|---|
| Type | Assault rifle (MSBS Grot C) Bullpup assault rifle (MSBS Grot B)[source] | — |
| Place of origin | Poland[source] | — |
| Used by | See Users[source] | United States[source] |
| Wars | Russo-Ukrainian War Russian invasion of Ukraine M23 campaign[source] | War in Afghanistan Iraq War[source] |
| Designer | Adam Gawron, Bartosz Stefaniak, Grzegorz Misiołek, Maciej Sajdak[source] |
980 mm (39 in) (Grot C, stock extended) 720 mm (28 in) (Grot B)[source]
Length
Single source1207 mm (47.5")[source]
Barrel length · source measurement 1
Single sourceBarrel length · source measurement 2
Single sourceBarrel length · source measurement 3
Single sourceGrot S · source measurement 4
Single sourceGrot S · source measurement 5
Single source254 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)[source]
Barrel length
Single source673 mm (26.5")[source]
Rate of fire
Single source700–900 rounds/min[source]
Muzzle velocity
Single source890 m/s (2,900 ft/s)[source]
Bars compare reported quantities only. A larger figure does not make a system better; configurations and test conditions differ.
Accuracy International / Remington Arms[source] |
| Designed | 2007[source] | — |
|---|
| Manufacturer | FB "Łucznik" Radom[source] | Accuracy International[source] |
|---|
| Produced | 2007–2017 (prototypes) 2018–present[source] | — |
|---|
| Variants | See Variants[source] | Mk 13 MOD 5 Mk 13 MOD 7[source] |
|---|
| Cartridge | 5.56×45mm NATO 7.62×39mm[source] | .300 Winchester Magnum[source] |
|---|
| Action | Short-stroke gas piston , rotating bolt[source] | Bolt action[source] |
|---|
| Feed system | 30-round detachable 5.56×45mm NATO and 7.62×39mm STANAG box magazines , 60-round casket magazine[source] | 5-round magazine (MOD 5)[source] |
|---|
| Sights | Integrated Picatinny rail for various optical sights and Picatinny attachable iron sights[source] | Nightforce Advanced Tactical Riflescope[source] |
|---|
| In service | — | 2001–present[source] |
|---|
| Calibre | — | .308[source] |
|---|
| Country of origin | — | United Kingdom[source] |
|---|
| Reported operators |
| — |
|---|