INA Model 953
Encyclopedia
The INA Model 953 is Brazilian submachine gun
Submachine gun
A submachine gun is an automatic carbine, designed to fire pistol cartridges. It combines the automatic fire of a machine gun with the cartridge of a pistol. The submachine gun was invented during World War I , but the apex of its use was during World War II when millions of the weapon type were...

 - a modified Madsen M/50.

It was manufactured by the Industria National de Armas S.A. in São Paulo
São Paulo
São Paulo is the largest city in Brazil, the largest city in the southern hemisphere and South America, and the world's seventh largest city by population. The metropolis is anchor to the São Paulo metropolitan area, ranked as the second-most populous metropolitan area in the Americas and among...

 Brazil
Brazil
Brazil , officially the Federative Republic of Brazil , is the largest country in South America. It is the world's fifth largest country, both by geographical area and by population with over 192 million people...

 under license for Madsen. Production began in 1950. The first Model was marked M.B.-50 and was manufactured till 1953 and was marked with a large Brazilian crest. In late 1953 the Model 1953 was introduced. Improvements on the 1953 model were a larger magazine housing and a metal loop riveted to the lower right side of the magazine housing. The loop could then hold the magazine housing together. 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 INA Model 53 is made of stamped sheet metal. It's an open bolt design which means it fires when the bolt is in the locked back open position with a fixed firing pin. The firearm is stamped from 2 pieces of sheet metal which are shaped with integral rear pistol grip and magazine housing. The two pieces fit together like a clam shell with the hinge at the rear of the pistol grip. It splits in half right down the middle of the top and bottom of the receiver. The entire firearm is held together with a barrel locking nut which is threaded onto the fore section of the two receiver halves. The folding stock is made of tubular steel and it folds onto the right side of the firearm.

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. To fire the Model 953 you must grip the magazine housing and hold down the safety lever.

Revolutionary Carlos Marighella
Carlos Marighella
Carlos Marighella , was a Brazilian Marxist revolutionary and writer.Marighella's most famous contribution to guerrilla literature was the Minimanual of the Urban Guerrilla, consisting of advice on how to disrupt and overthrow an authoritarian regime aiming a revolution. He also wrote For the...

recommended this as the "ideal submachine gun for the urban guerrilla" in his "Minimanual of the Urban Guerrilla"
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