I've run at least 5000 BBs out of my stock KSC M11 (on propane) the past two years and it's still going very strong. As with most airsoft guns, AEG or gas, it sounds like the luck of the draw. I've read some reports of the plastic bolt breaking after a couple hundred rounds, others have cleared 10,000 rounds.
Heed what Dozer said about too much oil on the hop up rubber and the mag rubber. They swell, they tear, then they don't seal properly, and finding replacements is possible, but freaking hard, esp. the hop up rubber.
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