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The red cylinder is different from all the others. It doesn't have the extra "vent" hole that the others have. When I put a m130 spring into the red cylinder I ended up with an extra 10fps vs my gold cylinder. Your mileage may vary.
The springs are all interchangeable between cylinders.
They aren't standard aeg springs though. Totally different dimensions. You can get APS2 type springs and cut them down if you want a custom velocity, or you can grab a Systema one from Doubletaptactical.ca. Depends on what you're trying to do.
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