Does anyone cut there own springs? I know AGD sells the grey ones to be cut down, but I never hear anyone talk about doing it. I am considering trying it because its relatively cheap and lets me fiddle with my mags more. What is the ultimate goal of grinding your own spring? How do I know when I'm done? Does it make the gun more gentle on paint? I got a Tac-One recently (first x valve) and it breaking more than any classic I've ever owned.