My R127DF FM receiver for the Futaba 6XAS it has a round sticker on it that has the number 80 on it. Is this the channel number and would this be a High? Also the crystal in the reciever says (I believe) 72.50, or something like that.

If I go and buy another receiver i.e. a Futaba R127DF and buy the same crystal number to put in it I should be OK to fly it a second plane with it, right?

IF it is illegal to take crystals out then why do I see so many at eBay that are sold that way? I must totally be missing something here.