4.2 inch M30 Mortar

4.2 inch M30 Mortar
History of the 4.2in Chemical Mortar
4.2 inch M2 mortar
60mm mortar

FM 23-91:Mortar Gunnery


General Data

  • The 4.2 inch M30 mortar was a rifled muzzle-loading weapon designed for high-angle fire.

  • Weight (with base plate, base ring, and sighting equipment): 626 lb.
  • Barrel assembly: 158 lb
  • Standard assembly: 58 lb
  • Bridge assembly: 151 lb
  • Rotator assembly: 57 lb
  • Base plate: 108 lb
  • Base ring: 100 lb
  • Sighting equipment: 4 lb

  • Range: 6,500 yards

  • Ammunition:
    • Ammunition for the M30 (T104) was issued as complete rounds, similar to those for the 4.2 inch M2, but had extended length of cartridge container and larger propelling charge. The round consisted of shell, fuze, propelling charge, and ignition cartridge. When fired, the shell was stabilized in flight by rotation transmitted to the shell by means of the pressure plate expanding the rotating disk on the base of the shell thus forcing the disk to engage the rifling in the bore. The shell, which had a deep cavity and suplementary charge, was fitted with a point detonating fuze. The ignition cartridge was housed in the cartridge container extension and was held in place by the striker nut which contained the striker.


     Issued to US forces beginning in 1951, the M30 gradually replaced the M2.

     The propelling charge consisted of a number of increments of propellent powder in the form of square sheets assembled on the cartridge container. When the round was inserted into the bore and released, it slid to the bottom where the firing pin drove the striker into the primer of the ignition cartridge. Flame from the ignition cartridge flashed through vents in the cartridge container extension to ignite the propellant, thus firing the round.

     Because of its size and weight, the weapon was used as Regimental artillery, often vehicle mounted, and was invaluable as support for infantry actions.

Image on right: Heavy Mortar Co., 38th Regiment, U.S. 2d Infantry Division, firing M30 4.2 mortar at Communist positions on Hill 773 near Yanggu, Korea, 13 August 1951.
4.2 M30 in action during Korean War
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A SOLDIER DIED TODAY

He was getting old and paunchy and his hair was falling fast,
And he sat around the Legion, telling stories of the past.
Of a war that he had fought in and the deeds that he had done,
In his exploits with his buddies; they were heroes, every one.

And tho' sometimes, to his neighbors, his tales became a joke,
All his Legion buddies listened, for they knew whereof he spoke.
But we'll hear his tales no longer for old Bill has passed away,
And the world's a little poorer, for a soldier died today.

He will not be mourned by many, just his children and his wife,
For he lived an ordinary and quite uneventful life.
Held a job and raised a family, quietly going his own way,
And the world won't note his passing, though a soldier died today.

When politicians leave this earth, their bodies lie in state,
While thousands note their passing and proclaim that they were great.
Papers tell their whole life stories, from the time that they were young,
But the passing of a soldier goes unnoticed and unsung.

Is the greatest contribution to the welfare of our land
A guy who breaks his promises and cons his fellow man?
Or the ordinary fellow who, in times of war and strife,
Goes off to serve his Country and offers up his life?

A politician's stipend and the style in which he lives
Are sometimes disproportionate to the service that he gives.
While the ordinary soldier, who offered up his all,
Is paid off with a medal and perhaps, a pension small.

It's so easy to forget them for it was so long ago,
That the old Bills of our Country went to battle, but we know
It was not the politicians, with their compromise and ploys,
Who won for us the freedom that our Country now enjoys.

Should you find yourself in danger, with your enemies at hand,
Would you want a politician with his ever-shifting stand?
Or would you prefer a soldier, who has sworn to defend
His home, his kin and Country and would fight until the end?

He was just a common soldier and his ranks are growing thin,
But his presence should remind us we may need his like again.
For when countries are in conflict, then we find the soldier's part
Is to clean up all the troubles that the politicians start.

If we cannot do him honor while he's here to hear the praise,
Then at least let's give him homage at the ending of his days.
Perhaps just a simple headline in a paper that would say,

Our Country is in mourning, for

A SOLDIER DIED TODAY

© 1987 A. Lawrence Vaincourt



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