M2 60mm Mortar: Build 1

Area-effect, Cold War, M2 60mm Mortar, Weapons, WWII

The project started with a good deal of research, finding pictures of all the component parts. From this I calculated dimensions and drew up plans.

The M2 is quite a bit more complicated than the SMBL 2″ used by the British. For my flat laser cut parts, I’m looking at around 3x as many pieces: plus a number of cast or printed parts.

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The baseplate is the first component to be assembled. This heavy plate is designed to stick into the ground to control and direct the recoil.

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Then the feet for the bipod legs and the hinge parts, Although the M2 is complicated, it does fold down quite tidily, which means a lot of moving parts.

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With the legs in place, the mortar starts to take shape. The tube through the middle will have the elevation control going through it, at the top of it will be the T-piece where the windage adjustment will sit.

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The thread arrived, it is a 20mm trapezoidal threaded rod which should be coarse enough to allow quick adjustments to be made, but fine enough to allow for accurate fire adjustment.

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The elevation adjustment screw in place and the T-piece at the top of the column (where the windage screw will go). There is a slit in the back of the column in which a screw sits that locks the inner column into the outer and engages the screw thread.

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When the elevation is raised to maximum, you can just see the thread through the slot at the back, but this will effectively be hidden by the barrel.

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The next components will be the windage adjustment and endcaps. These are going to be 3D printed in ABS for strength and will also have the barrel clamp.

 

If you are interested in the history of the M2, you can check out the introduction article here.

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M2 60mm Mortar: Introduction

Area effect, Cold War, History, M2 60mm Mortar, Weapons, WWII

The M2 Mortar was a US light service mortar designed for close support by infantry at company level. These filled the gap between hand grenades/rifle grenades and the larger (81mm) M1 used at battalion level.

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The 81mm mortar in use with a mortar company of the 92nd Division.

It has its origins, much like nearly every modern mortar, in the WWI-era Stokes design. It was smoothbore, drop-fired and used a bipod/baseplate system.

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Doughboys with the WWI Stokes mortar.

Light mortars of the inter-war/WWII period fell into two categories: The first were simple, tubes held firmly by the user when fired and aimed by direct line of sight (such as the British SMBL 2″ and Japanese T89). The latter were complex, with coarse thread screws or other systems to control elevation and windage for very accurate controlled fire.

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The M2 fell into the latter category, with an attachment for a sight that could be used for both direct and indirect fire. As a result, it could be used accurately at close to its maximum range (nearly 2,000 yards).

M4-Mortar-Sight

The sight used for the M2.

Post-WWII, the M2 served in Korea and numerous Colonial conflicts with the French, finally in Vietnam. The Chinese also locally produced their own copy. It was eventually replaced in 1978 by the M224 which is still in service today and increased range capacity by about 1/3rd.

 

You can see some footage of the M2 in action here:

The Airsoft version currently being built will fire TAGs and moscarts, with a possibility of using TLSFX shells as well.