FORCETALLY
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At a glance
Measured figures
LMT Modular Ambidextrous Rifle System · Length · "Maximum"
Single source914 mm (36.0 in) ("Maximum")[source]LMT Modular Ambidextrous Rifle System · Length
stock collapsed
Single sourcestock extended /
Single source29.1 in (740 mm) stock extended / 21.9 in (556.3 mm) stock collapsed[source]
Effective; Sights fixed to
Single sourceSights fixed to 100 yards (91 m)[source]
L129A2 exact named variant; not a sibling record · Barrel length
Single sourceStgw 25 exact named variant; not a sibling record · Barrel length
Single sourceStgw 25K exact named variant; not a sibling record · Barrel length
Single source18 in (457 mm)[source]L129A2 exact named variant; not a sibling record
16 in (406 mm)[source]Stgw 25 exact named variant; not a sibling record
12 in (305 mm)[source]Stgw 25K exact named variant; not a sibling record
Barrel length
Single source8 in (203.2 mm)[source]
cyclic (= 7 1 ⁄ 2 / second)
Single source450 rounds/min cyclic (= 7 1 ⁄ 2 / second)[source]
Muzzle velocity
Single source900 ft/s (274 m/s)[source]
Bars compare reported quantities only. A larger figure does not make a system better; configurations and test conditions differ.
Configuration
| Specification | LMT Modular Ambidextrous Rifle System | M3 submachine gun |
|---|---|---|
| Type | Assault rifle Battle rifle[source]LMT Modular Ambidextrous Rifle System · Type | Submachine gun[source] |
| Place of origin | United States[source]LMT Modular Ambidextrous Rifle System · Place of origin | United States[source] |
| In service | 2015 - present[source]LMT Modular Ambidextrous Rifle System · In service | 1943–present[source] |
| Designer | Lewis Machine & Tool Company[source]LMT Modular Ambidextrous Rifle System · Designer | George Hyde[source] |
| Manufacturer | Lewis Machine & Tool Company[source]LMT Modular Ambidextrous Rifle System · Manufacturer | General Motors , others[source] |
| Cartridge | 5.56×45mm NATO 7.62×51mm NATO 6.5mm Creedmoor[source]LMT Modular Ambidextrous Rifle System · Cartridge The MARS-L (light) assault rifle variants are chambered for the 5.56×45mm NATO intermediate cartridge , and the MARS-H (heavy) battle rifle and designated marksman rifle variants for the 7.62×51mm NATO , 6.5 mm Creedmoor or similar fully powered cartridges .[source]Design · explicit MARS-L/MARS-H cartridge scope MARS-H based designated marksman variant, chambered in 6.5 mm Creedmoor .[source]L129A2 · explicit MARS-L/MARS-H cartridge scope Swiss MARS-H-based designated marksman rifle chambered in 7.62×51mm NATO.[source]7.62mm Zf Stgw 20 · explicit MARS-L/MARS-H cartridge scope LMT's MRGG-A is a member of its Modular Ambidextrous Rifle System-Heavy (MARS-H) family, which are commonly described as AR-10-style rifles, but is chambered to fire the 6.5mm Creedmoor round.[source]MK24 Mid-Range Gas Gun-Assault · explicit MARS-L/MARS-H cartridge scope | .45 ACP (11.43×23 mm) 9×19mm Parabellum .30 Carbine (7.62×33mm)[source] |
| Action | Gas-operated , rotating bolt (internal piston, not direct impingement ) or Short-stroke piston[source]LMT Modular Ambidextrous Rifle System · Action | Blowback , open bolt[source] |
| Feed system | 5.56×45mm NATO : 30-round detachable box magazine 7.62×51mm NATO 20-round detachable box magazine[source]LMT Modular Ambidextrous Rifle System · Feed system | 30-round or 32-round detachable box magazines[source] |
| Used by | — | See Users[source] |
| Wars | — | World War II Chinese Civil War Greek Civil War Indonesian National Revolution First Indochina War Korean War Cuban Revolution Algerian War Bay of Pigs Invasion Vietnam War The Troubles Laotian Civil War Malayan Emergency Sino-Indian War Communist insurgency in Malaysia (1968–1989) Papua Conflict Rhodesian Bush War Cambodian Civil War Turkish invasion of Cyprus Shaba II Cambodian–Vietnamese War Sino-Vietnamese War Nicaraguan Revolution Salvadoran Civil War Argentine Dirty War Falklands War Soviet–Afghan War Iran–Iraq War Persian Gulf War Moro conflict Burundi Civil War Kosovo War First Ambon riots War in Afghanistan Iraq War Syrian Civil War[source] |
| Designed | — | 1942[source] |
| Unit cost | — | Approx. US$ 20 (1943; equivalent to $279 in 2025)[source] |
| Produced | — | 1943–1945; early 1950s[source] |
| No. built | — | Total: 655,363 M3: 606,694 M3A1: 48,669[source] |
| Variants | — | M3A1 PAM1 PAM2 T29[source] |
| Sights | — | Fixed rear peep sight and blade foresight, calibrated to 100 yards for caliber .45 M1911 ball ammunition[source] |
| Former operator · Austria | — | Austria[source] |
| Former operator · Brazil | — | Brazil[source] |
| Former operator · People's Republic of China | — | People's Republic of China[source] |
| Former operator · France | — | France[source] |
| Former operator · Greece | — | Greece[source] |
| Former operator · Italian Partisans | — | Italian Partisans[source] |
| Former operator · Japan | — | Japan[source] |
| Former operator · Kingdom of Laos | — | Kingdom of Laos[source] |
| Former operator · Republic of China | — | Republic of China[source] |
| Former operator · South Korea | — | South Korea[source] |
| Former operator · Iran | — | Iran[source] |
| Former operator · North Vietnam | — | North Vietnam[source] |
| Former operator · South Vietnam | — | South Vietnam[source] |
| Former operator · Norway | — | Norway[source] |
| Former operator · Soviet Union | — | Soviet Union[source] |
| Former operator · United Kingdom | — | United Kingdom[source] |
| Reported operators |
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