The Shocktech lower tube kit comes with the incredible Shocktech RAT Valve, Phat Hammer, IVG, Cocking Rod and springs
Shocktech lowers kit. Set the IVG 2 turns in from flush, and you PSI to 300. with a good paint to barrel match, you should be around 300 FPS. If so, do all your velocity adjustments off the regulator.
Be happy, shoot Shocktech products