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I've left springs fully compressed for 9mo before with 0fps drop.
Springs only lose tension from being worked. If they're shitty springs, they haven't been worked in, and they'll lose tension much faster in the first 2000 shots or so, but once they settle they'll shoot that fps for a long time.
Prometheus works in their springs, and I've got an MS100 that's 8yrs old and still does 345fps
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