Yes, it should work with any undercocking kit. The Python/iFit system adds about 2" to the length of your barrel. Personally if I were you, I'd send the barrel to be bored to accept Freak inserts and then pick up a .675, .679 and a .682 insert. Super_Stanchy on here does Freak boring if you decide to go that route.
"Originally posted by painthappy: I actually LOL'd at this... I don't normally LOL when I type LOL, but this time I mean it."
"Originally posted by BigOldSkool: I've played pump against the worst of the paintball scum bags, do I hang it up? Nah.... I play angrier."