JM Cloche

The JM cloche is an element of the Maginot Line. It is a non-retractable non-rotating cupola of steel alloy like GFM cloches, but are armed with twin heavy machine guns, as opposed to the lighter automatic rifles associated with the GFM. There are 179 JM cloches on the Maginot Line.

JM is an acronym for Jumelage de Mitrailleuses (twin machine guns). While the MAC 31 heavy machine guns were of the same caliber (7.5mm) as the GFM guns, they had a longer practical range 1,200 metres (3,900 ft) and a maximum range of 4,900 metres (16,100 ft), with a 500 round per minute rate of fire.

Read more about JM Cloche:  Description, AM Cloche

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JM Cloche - AM Cloche - AM Conversions
... Ten JM cloches were modified to accept a shortened 25mm anti-tank gun in place of the twin machine guns ...