The StG 44, also known as the Sturmgewehr 44, is a German assault rifle developed during World War II by Hugo Schmeisser. The StG 44 is considered the father of all assault rifles, boasting a select-fire, compact design, and high rate of fire which made it popular with many German soldiers. After WW2 had ended it paved the way for modern assault rifles after the Soviets created their own assault rifles such as the AK47 which would become one the most prolific assault rifles in the modern era.
The MG 42, also known as the Maschinengewehr 42, is a light machine gun developed during World War II by Werner Gruner. The MG 42 was notorious for it's high rate of fire and it's extensive usage by the Germans in the army. It was called "Hiter's Buzzsaw" because with its rate of fire it could literally bisect a man. It is most famous in D-Day, where it was used to gun down thousands upon thousands of Allied soldiers. The barrels would get so hot that they would need to be swapped out, the crew manning the MG 42 would have at least 5 barrels ready to swap. The MG 42 is still used in some militaries today, albeit a little bit more modernized.