is a Swedish crust/hardcore band formed in Lidköping in 2002. Blending d-beat, crust punk, hardcore, and metallic influences drawn from bands like Tragedy, Skitsystem, and Neurosis, they developed a powerful sound marked by dark melodies, dual vocals, and politically charged themes. Remaining active for over two decades, M:40 continues to be a respected force within the Scandinavian DIY punk scene.