| Year | August 1941 |
| Vehicle Type | [@type] |
| Origin & Designer | [@designer] |
| Numbers Produced | 2.200 |
| Crew | 5 (Commander, Gunner, Loader, Driver & Assistant Driver) |
| Main Armament | 1 x 75mm L/36 M1897A4 Gun |
| Main Armament | [@sponson_traverse] |
| Elevation | -10° to +29° (Manual) |
| Turret Traverse | [@turret_traverse] |
| Gun Traverse | 20° Left & Right (Manual) |
| Gun Mount | [@gun_mounts] |
| Maximum Range | [@maximum_range] |
| Armour Penetration | [@armour_penetration] |
| Gun Sight | 6.14m |
| Secondary Armament | [@secondary_armament] |
| Smoke Discharger | 59 x 75mm |
| Ammunition Carried | [@ammunition_carried] |
| Height | 2.50m |
| Width | 1.92m |
| Length | 6.14m |
| Combat Weight | 9.100 kg |
| Ground Clearance | 0.28m |
| Fording Depth | 0.81m |
| Trench Crossing | 0.76m |
| Obstacle Clearance | 0.30m |
| Climbing Ability | 31° |
| Radio | [@radio] |
| Armour | Upper Hull Front: 13mm Lower Hull Front: 6.4mm Upper Hull Sides: 6.4mm Lower Hull Sides: 6.4mm Hull Rear: 6.4mm Hull Top: Open Hood Top: 6.4mm Hull Bottom: 6.4mm Gun Shield Front: 15.9mm Gun Shield Sides & Rear: 6.4mm |
| Engine | White 160AX (Petrol) |
| Transmission | 4 Forward & 1 Reverse |
| Maximum Road Range | 198 miles (320 km) |
| Maximum Cross Country Range | 175 miles (282 km) |
| Maximum Water Range | [@maximum_water_range] |
| Maximum Road Speed | 45 mph (72 kph) |
| Maximum Cross Country Speed | 9 mph (15 kph) |
| Maximum Water Speed | [@maximum_water_speed] |
| Variants | M3A1: Quantity: 324 Year: 1941 New Gun Mount (M5) |
| Notes | Based on the chassis of the M3 and built by Autocar. The M3 GMC was an early attempt at providing mobile units with direct fire, the gun itself was of French design and the vehicle was employed in the Tank Destroyer role along with the lighter M6 37mm GMC, the M3 GMC was gradually phased out due to the introduction of the more potent M10, the US Marines still found a use for them and they were kept in service until 1945 when they replaced them with M7s. The M3 GMC saw action in Philippines, North Africa and Sicily and with the Marine Corps in Saipan, Peleliu and Okinawa. |