From the research I've done, only a few thousand survived the Second World War. The StG44 was then used by the Volkspolizei (German; lit "People's Police") up until 1960. Only a handful of operational models remain in the world today.
stg44, mp40, panzershreck, karabiner,
How many Jews survived at the end of world war 2
About 534,617 soldiers survived world war I. 595,000 soldiers served and 60,383 were dead.
About 55'692'800 troops in total survived the war on both sides combined
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three million
16 million
Over 40 million casualties resulted, including approximately 20 million military and civilian deaths. Its not how many that survived.
In the US six million service men and women survived World War 2. Millions more worldwide survived. The Germans had the greatest loss of life in the war which meant they did not have very many young men to repopulate Germany.
Hitler was obsessed with small arms. Many weapons developed were ones like the MP40 and Walther P38. Many big guns were used such as the MG42, STG44, and the KAR98k.