You can choose between the SSG10 A1 and the SSG10 A2 configuration. Additionally, you can choose the installed spring. (country overview) While the A1 already comes assembled, you need to put together the stock and the upper of the A2. This is easy but we also made a video that explains this five-minute process.
All Joule measurements were taken with 0.46g BBs and all FPS measurements with 0.2 g BBs