After a crushing defeat in World War 1, Germany wanted revenge for how the allies had the right to take away many German territories, pay for all the damages as compensation, and make huge cuts on their army, naval, air force military. This made Germany's main focus between the post WW1 and the beginning of World War 2 on warfare production which gave them an advantage in pretty much every aspect. When the war started the Axis dominated and destroyed countries with their new tactics and guns that nobody knew how to stop. But due to Germany's mistakes all throughout the war and the United States becoming involved leading to new weapons, the Axis powers lost the war. After the war, many warfare strategies and weapons were still used and were building blocks for better warfare in the later decades. Throughout the course of WW2, new weapons and warfare tactics were created on both sides of the war, which lead to global advancement of warfare in the future.
During World War 2, many new guns were invented especially from the Germans.The first assault rifle, Sturmgewehr 44 also known as the StG44 was designed and came into service in 1942. This gun was very effective in battlefield, but was not effective in WW2 because the war was already over. This idea created a whole new breed of guns that offered a smooth fire action and had a 30 round magazine.(http://www.militaryfactory.com/smallarms/detail.asp'smallarms_id=51) The first Sturmgewehr 44 assault rifles arrived at the Eastern Front, where they were able to meet the greater rate of fire coming from Russian submachine guns, and with greater precision. Despite the success, the Sturmgewehr 44 came too late to make a significant difference in the WW2. After WW2, Sturmgewehr 44 assault rifles remained in use with nations and rebel forces friendly with the Soviet Union, such as East Germany, Yugoslavia, and various forces in the Middle East and Africa.