I received the springs. I cannot tell the difference in pump effort between the CCM and SLPS springs. This is with swapping the springs out of one gun; and quickly swithing between two guns, one with a Check It Tactical pump kit and one with a CCM Deluxe pump kit. The difference between the two set up, from a physical standpoint, is negligable. Either of them I can pump with two fingers tapping the end of the pump handle. Both are very light and smooth. I'm giddy that the Check It pump is so nice, especially considering its price in the Super Bowl Special at Paintball Gateway.
I'll get to tuning later, as the thug neighbor kids started showing up as I was tuning the CCM'd gun. They act friendly when they want something.