Hop Up bucking from JG manufacturer made from 80° rubber. Suitable for springs M130-M150. Correct and uniform spin of the fired bb is essential for accurate shooting. A stronger upgrade requires a harder HopUp bucking, because soft rubbers may deform from the higher power.
The bucking is suitable for most standard HopUp chambers of airsoft electric guns.
Jing Gong, also known as JG or GB (Golden Bow), is a Hong Kong manufacturer of airsoft guns and parts. Jing Gong is one of the world's largest airsoft OEM (Original Equipment Manufacturer) factories with a long history of manufacturing and large production volume. JG focuses on the production of lower and middle price range guns.
Their line of electric guns is based on "clones" of higher-end brands, many of which are adopted from Tokyo Marui. Jing Gong produces many affordable but high performance AEGs.