CDN_Stalker called it: The saw has no real way of guaranteeing spring/piston location at the end of firing the weapon.
But really, removing the spring is not even a 5 minute operation, more like 30seconds, and no tools are required. Unscrew a cap, pull a pin, tilt the stock, lift the feedtray, press the lever, pull out the spring. Done. Wham, bam, thank you maam. And I mean in between skirmish weekends, not just for over-winter storage (btw- we're playing at least thru the end of November here in Ohio with at least two large events on the schedule).
It also doesnt just help preserve the spring but also for making sure there's no load on the rest of the gears/parts of the mechbox while the gun sits.
It seems to help - I'm still getting about 400-420fps out of a systema M120 and all other parts stock after much firing when by the charts I should be netting 360-390fps on a brand new spring.
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