The first "assault rifle" (meaning, a small, lightweight, fully-automatic rifle firing relatively small ammunition, suitable for light infantry and paratroops) was developed by Germany. The design was adapted by the Soviets to develop the Automat Kalashnikov model 47, or "AK-47".
The assault rifle AK-47 was invented by Russian inventor Mikhail
Germany invented the first assault rifle-the Sturmgewehr or STG
The AUG (Armee Universal Gewehr) assault rifle was invented by Austrian small arms manufacturer Steyr Mannlicher GmbH.
Kalashnikov
Assault rifle.
Austria invented the first air rifle in the 1500's. The BB rifle was invented in the USA.
The SOAR (Special Operations Assault Rifle).
the United States
There are several different assault rifles - both by the true definition of an assault rifle and by the political motivated BATFE definition of a so-called "civilian assault rifle", manufactured by several different outfits. Which assault rifle did you have in mind, specifically?
The first true assault rifle debuted in 1942.
You will need to define assault rifle, and where you live. A TRUE assault rifle is a machine gun, and transfers of them are tightly regulated by the Federal government. What most people CALL an assault rifle is nothing but a semi-automatic rifle, and in most of the US, does not require a license to possess.
Only with a very small assault rifle, or a very large purse.