If it was true that springs never loose there tension over time, they wouldn't make replacement springs.. And guns that come 400 fps stock wouldn't shoot 300 fps a year later because Little jimmy didn't shoot 3 times in semi auto to uncompress the spring.
I have like 35, S120 spring right here. that will not Make a gun shoot over 300 fps. but if i take a fresh s120 spring, install it in that same exact gun it will shoot 400 fps easly... Springs wear out man.. After all this isn't a perfect world like you said.
I'll give you a few of these 120's if you'd like and lets see if you can get the same ratings as a new s120 spring.
It's not about the compression, it's about the cycles. Steel (the main material used to manufacture springs), has a particular type of fatigue life. If you cycle it a ton, it will lose SOME rigidity, as long as you don't overstress (not possible with AEG springs in an aeg... or very many coil springs in general) it, you won't create a failure, but the fatigue will slightly weaken it. This weakening WILL stop, as steel has an infinite cyclic fatigue life after it's initial settling phase, again, as long as you don't overstress it.
They break in from firing, not break down from compression. There's a large difference.
If coil springs got progressively weaker and weaker the longer things compressed them... click-pens would stop clicking if you left them open and all the cars out there that use coil spring suspension systems would be sitting on their bumpstops.
This is just another common misconception in airsoft...
Irregular spring tension/stress, thus the compression from the spring will cause fps reduction. Leave something sit compressed for a while that is designed for the tension to release, build up again, release, build up again, you will see inconsistent fps, if you leave it compressed for a period of time.
SLINKEY is right. axis, you're high.
