The Maginot Line - A misunderstood history

JM Reibel
or MAC Mle 1931

Twin light machine gun (7,5mm)

The JM Reibel came in two different versions: type T (tourelle = turret) and F (for casemates and cupolas). The main difference was the way the triggers were operated: the T model, for use in retractable turrets, made use of a Bowden cable. The F model was directly operated by a soldier, and had the typical layout (handgrips and shoulder stocks. The F model was used in JM cupolas and casemates.

On the 24th of december 1931, firing tests were carried out at the casemate Bois de Kanfen-Est. It soon proved to be an accurate weapon.

When mounted in a casemate, the JM was connected to a pipe in the wall by an extendable tube to drop the spent cases into the fossé (ditch). In a cupola, a flexible tube was used.

Each JM Reibel needed around 20 litres of water per day for cooling purposes. Barrels were put in a bucket of water when overheated, or cooled by spraying water on them with a portable water sprayer.

Canon AC Mle 1934 47mm Different modes of fire were possible to achieve different effects. The image on the left was photographed inside a firing chamber of casemate Sinnesberg Est-Ouest and shows crew instructions.

Fire modes
Ammunition 7.5 x 54mm (also used on the Fm 24/29)
Type Velocity
Model 1929 D
heavy ammo 694m/s
Model 1929 C
lightweight ammo 840m/s
Model 1929 T
tracer ammunition
Model 1929 TP
tracer/armour-piercing ammo