[mcguyver]

Hey, Stokes, the C.A. pistons are just fine. And they use quite a good piston head as well. The new C.A. guns come with 7mm metal bushings. You could use a new spring, guide and that's about it.

But to be honest, I wouldn't bother with the upgrades. When your gun is shooting 330 fps out of the box, Upgrading to 390 fps will really only give you a modest improvement in performance. And C.A. uses their own motor, so who knows how it'll perform with a heavier load.

Evereyone is on an "I gotta upgrade this gun" kick and really it's not necessary. Try your gun stock for a season and you'll find out that upgrades aren't all they're cracked up to be.

I have several upgraded guns, all of which I can't use most of the time, and they require far more maintenance and repairs than they're worth. I spend most of my time using stock guns. Most places won't let you use a 400 fps full auto gun and even in large open areas it gets frowned upon.

The new C.A guns seem to be fairly good out of the box. If you're looking for shot consistancy and accuracy (which is 1000 times more important than velocity) look at a good piston head set, cylinder and tightbore barrel. I'm partial to the Systema silent head set myself and Prometheus makes some good cylinders and barrels as well.

I've played with guys using very well tuned guns shooting 300 fps that will outrange and have better accuracy that guns shooting 400 fps.

It's your gun, time and money, so it's really up to you.