I could not find any usefull info online on the Hitec O5S so I compared the one I have here in my hand (it doesn't say anything on it about being full range) to an 8 channel full range Futaba.
The antenna wires are both the same length, good sign. The wire on the O5S is half as thick as the Futaba, don't know how much difference that makes but I would bet it has some effect.
My concern with the O5S is weither it can handle the amperage draw of standard size servos, keep in mind this receiver is made to use with micro servos.
I use mine on smaller electrics, it is in an Eflite Cessna right now and I have another one in a GWS Slo-Stick.