Caseless: "I am trying to determine if the RFB is closer to a no maintenance required gun like an AK or a low maintenance rifle like the FAL."
scandium_wheelgunner: You are assuming as a premise something that needs to be proven. If you think the AK is lower maintenance than the FAL, make a case for it, don't just assume it.
I have both and I don't agree. Both barrels get dirty at the same rate. The AK gas system allows some exhaust gas to find its way into the receiver, and the FAL system doesn't. After the AK gas piston clears the actual gas block, the piston diameter is less than the gas tube, so the gas tube then provides a path for the exhaust gases back into the receiver, mush like the the notorious AR stoner system. After firing your AK stick your finger in the gas piston hole in the sight block from the receiver end, it will come out black. Both gas-piston faces get black at the same rate and both will work fine when black.
If you mean maintenance to remove dirt that comes in from the outside, the AK action is less-well sealed, whenever the safety is off, the action is wide open to the elements. The FAL action is sealed at all times.