[2] Revolutionary Carlos Marighella recommended this as the "ideal submachine gun for the urban guerrilla" in his "Minimanual of the Urban Guerrilla"[3] It was manufactured by the Indústria Nacional de Armas in São Paulo Brazil under license for Madsen, which began in 1950.

Also the retracting handle was changed on the Model 953 to the right side instead of the top as was the buffer spring and the shape of the extractor, ejector and the firing pin.

The firearm is stamped from 2 pieces of sheet metal which are shaped with integral rear pistol grip and magazine housing.

The entire firearm is held together with a barrel locking nut which is threaded onto the fore section of the two receiver halves.

The Model 953 fires in full auto only and it also has a unique feature, a safety lever in front of the forward magazine housing.