In 1980s Japan it was illegal to own a firearm, but there was a large interest in them. Because of this interest, manufacturers started to produce realistic looking spring-powered guns. These guns fired several calibers of plastic or rubber BBs, but were eventually standardized into 6 mm and 8 mm sizes. The early spring-powered weapons then morphed into gas-powered ones, using a variety of systems. The hobby then migrated to North America in the mid 1990s. Then low powered spring guns transformed into Classic airsoft gun. About ten years after this time, Japan hit a recession just as AEGs, or automatic electric guns, hit the market. Many old manufacturers were lost, leaving Tokyo Marui, inventor of the AEG, as the primary manufacturer. Marui then invented an improved Hop up system, further improving the accuracy and range of the weapons. In the early 2000s, Classic Army of Hong Kong entered the scene and gradually improved its quality of guns until it now rivals Tokyo Marui. A few years later countless Chinese brands flooded the market with cheap entry level weapons.