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I've used the following combination in my RPK with fairly good success and very little if no visable wear after 20K rounds. I was driving a 650mm tightbore, so some of the parts might be a little overkill for a 400fps setup. I'm not suggesting that you go my route as the spring/tightbore/bearing spring guide and piston head pushed the FPS up to the mid 400s, but just take a look and see what you can take for your own use.
Stock CA Ver 3 Shell
Prometheus Double Torque Gearset
Prometheus Bore-Up Cylinder Set (Bearing Piston Head)
G&P Polymidal Piston (Full Tooth)
Prometheus Bearing Spring Guide
Prometheus Anti-reverse Latch
Prometheus Tappet Plate
Systema M140 Spring
Cheers,
Vic.
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