I'm fairly certain that the end cap does not provide adequate restriction to reduce mechbox impact. What model AEG are you firing? The V2 builds (MP5, Crapalite, G3) are prone to mechbox fatigue. I don't know if it's a serious issue with the stock spring though as I don't know of any stock AEGs breaking a gearbox, but I hear about only a small fraction of failures in the world.
Your first AEG can be a lot of fun. I blasted off a lot of dryfire shots when I got my first gun.
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