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in all the cylinders below red (m150)...you can swap the springs around. I had a red and black cylinder (m150 and m90) respectively...and bought the m110 and other spring (sorry can't remember) for the gold and blue power levels separately...$20-30 dollars I think (it was a while ago).
Take's about 2 min total to undo the end of a cylinder, take the spring out, swap the other in and do it up. Taking the rear end off is easier since you don't have to fiddle lining up the piston into its grooves. Taking the front off is sometimes better...to clear out crud and bb chips.
The "extra" port on the sub red cylinders is to allow the piston to build up speed before it starts to compress/push air. There's a good write up about "matching cylinders to barrel length" that explains things.
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