The two turrets of block 4. The left one is a cloche JM (Jumelage de Mitrailleuses or twin MG), armed with a twin 7,5 mm heavy machine-gun model 1931, nicknamed Reibel. This weapon had to provide frontal infantry fire. The right turret is a cloche GFM (Guetteur Fusil-Mitrailleur or Observer and light machine-gun). This turret was equipped with a periscope and a 7,5 mm light machine-gun type 24/29.