You can replace the banjo fittings with those from Tippmanns (You'd need one like the one from the LP kit for the RT/Cyclone kit)
As for a reg,I'd say get a AKA 2 Liter over anything else.They have the fastest recharge rate and highest flow you can get.I got +/- 2 fps across the chono just as advertized.
Recommend the Shocktech body kit for it as well.Milling looks similar to what you have ,but,it allows for bolt removal out the back.
I highly recommend the L7 Bolt kit from
TechTPaintball.com- Performance Matters ,You'll notice no kick at all when fired and you'll end up only have 3 o-rings that can go bad.