Excellent additions, Scootia!
Here, a little known postwar smg: Ingram M6.
I gave a wrong information about the first smg made in Peru. It was not the Navy built MPG-79, but the also locally made (Fabrica de Armas Los Andes) Ingram M6 (also known as MAC-6) during 1950s. Around 8000 were built in two models: Militar (military) and Policía (police), the former with a plug-on spike bayonet; unfortunatelly, I was unable to find an image with the peruvian crest or other markings. Cheers.
NB: I didn´t know anything about this gun (even its existence), or any history of its service in Peru or Cuba until this year. If someone can give me more information, I will be very grateful. Cheers.