Nishimura decides it is time to maintain their CA870 airgun after neglecting it for about three years. The motivation for this sudden productivity comes from a noticeable drop in power and a trajectory that has become quite unpredictable. To fix these issues, a new hop-up rubber and a fresh spring are prepared for installation, with a goal to return the equipment to its former functional state.

Before taking everything apart, a quick test reveals the airgun is firing at a lower velocity than expected. Upon inspection of the internal components, a cracked cylinder is discovered, which is a bit of an unwelcome surprise. Despite this, the cleaning process moves forward, and the old spring is compared to the new one, showing a slight physical difference that accounts for the loss in performance over time.

Once the new parts are installed and the barrel is cleaned, the airgun shows a clear improvement in both speed and consistency. A trip to a local field confirms that the shots are now traveling straight and hitting targets more reliably. The final takeaway is that while airsoft guns are durable enough to survive years of neglect, a little bit of refreshing every few years helps keep the aim from becoming a matter of pure luck.