Multiple Gun Motor Carriage M131-8

M13: General
Date of first acceptance January 1943 Total acceptances 1103
(628 converted to MGMC M16)
Manufacturer White Motor Co. Crew
5 men:
  • Commander in cab right
  • Gunner in turret
  • Two cannoneers on right and left of turret
  • Driver in cab left
M13: Dimensions
Combat weight 18,500lbs
Height 88"
Length with winch 256"
Gun overhang forward 0"
Width 77.9"
Front tread 64.5"
Rear tread 63.8"
Wheelbase 135.5"
Ground clearance 11.2"
M13: Armament
Type Mount Ammunition Traverse Max traverse rate Elevation Max elevation rate
Two .50cal M2TTHB MG M33 5000 rounds 360°
60°/sec +90° to -10°
Reflex sight M18 or illuminated sight Mk. 9 Mod. 1
M13: Armor
Rolled face-hardened steel
Location Thickness Angle from vertical
Radiator louvres .25"
Windshield cover .50"
Sides .25"
Rear .25"
Hood top .25"
Rolled face-hardened steel
Location Thickness Angle from vertical
Shield .25"
0° to 35°
M13: Automotive
Engine White 160AX; 6 cylinder, 4 cycle, in-line gasoline
Horsepower Net: 147@3000rpm Torque Net: 325 ft-lb@1200rpm Fuel capacity 60gal
Transmission Spicer 3461 constant mesh, 4 speeds forward, 1 reverse
Steering Steering wheel
M13: Suspension
Type Road wheels Track return rollers
Front: Semi-elliptic longitudinal leaf spring
Rear: Vertical volute spring
Front: Steel ventilated disc
Rear: 1 bogie/track;
4 dual/bogie
1 dual/track
Drive sprockets Idlers Shock absorbers
18-tooth front drive Spring-loaded at rear of track On front wheels
M13: Track
Center guide band type
Width 12"
Pitch 4"
Pitches/track 58 Track ground contact length 46.75"
M13: Performance
Max level road speed 45mph
Max grade 60%
Max vertical obstacle 12"
Min turning diameter 59'
Max fording depth 32"
Cruising range ~200mi, roads
~320km, roads

The M13 was based on the half-track personnel carrier M3, and used the M33 Maxson gun mount also used in the MGMC M14. The M13 was actually developed before the M14, and the M3 half-track was the vehicle used to test the M33 gun mount, but the first M14 was accepted a month before the first M13s.

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  1. TM 9-710 Basic Half-Track Vehicles (White, Autocar, and Diamond T). Washington, DC: War Department, 23 February 1944.
  2. Hunnicutt, R.P. Half-Track: A History of American Semi-tracked Vehicles. Navato, CA: Presidio Press, 2001. Reprinted from Half-Track, R.P. Hunnicutt ©2001, available from Presidio Press, 505B San Martin Drive, Suite 160, Navato, CA 94945.
  3. TM 9-223 Twin Cal. .50 Machine Gun Mount M33 and Multiple Cal. .50 Machine Gun Mount M45. Washington, DC: War Department, 27 July 1944.
  4. TM 9-1223 Ordnance Maintenance--Twin Cal. .50 Machine Gun Mount M33 and Multiple Cal. .50 Machine Gun Mount M45. Washington, DC: War Department, 1 June 1944.
  5. Doyle, David. U.S. Half-tracks: The Development and Deployment of the U.S. Army's Half-track Based Multiple Gun Motor Carriages and Gun Motor Carriages, Part two. Ed. Pat Stansell. Delray Beach, FL: The Ampersand Publishing Group, Inc., 2016.
  6. Crismon, Fred W. U.S. Military Tracked Vehicles. Osceola, WI: Motorbooks International, 1992.
  7. Chamberlain, Peter, and Chris Ellis. British and American Tanks of World War Two. Frome, England: Cassell & Co., 2000.
  8. Siemers, Cary. "USA's Half Track Gun Motor/Mortar Carriages." World War II Tanks & Vehicles and Advanced Squad Leader. 4 Jul 2001. 18 Sep 2001 <>.

Last updated 26 Jan 2021.
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© Copyright 2001-21 Chris Conners