rmac/md - congratulations on your purchase!
And in anticipation of the seemingly inevitable next question, here's my two cents regarding cleaning and lubing, based on the experience I've had over the past fifteen months:
The carbon buildup on the piston and mag tube is not a problem a long as the piston slides easily on the end of the mag tube. The action bars, and the collar they are clipped to, are chrome plated and don't get a lot of hard build-up; but if they do, they can certainly be cleaned very quickly and thoroughly with some CLP and a brass brush, bronze wool, or fine steel wool. I use bronze wool and find it works very well on the collar. The action bars clean up by simple wiping.
The piston itself is coated stainless steel. Usually, soaking in CLP and then wiping with a rag cleans it sufficiently. For a deep clean, or for very stubborn build-up, it can be very safely cleaned (after soaking a few minutes in CLP) with a brass brush, or bronze wool. You can use steel wool (or a steel tube-cleaning brush for the inside diameter), but it will diminish the coating over time, although this will in no way affect the performance of the piston.
As for cleaning frequency, I wipe the barrel extension and the action arms about every 800-1000 shells and re-coat with a VERY thin layer of white lithium grease (Lubri-Plate). This was suggested to me by Andrew, one of the gunsmiths at Fabarm. I have found this works beautifully to keep the gun smoothly cycling the lightest loads, and it doesn't collect and hold crud like most CLPs tend to. It also doesn't migrate from where I put it, keeping everything surrounding pretty clean.
I clean the gas system (piston and gas chamber), the outside of the mag tube, and the choke about every 2,000 rounds - mostly to keep the gun in good appearance and well-cared for, whether it needs it or not. I'll usually also drop the trigger assembly and spray it out and put a tiny drop of CLP here and there, since the gun is mostly apart by then anyway.
Good luck and safe shooting.