fc doesn't have any appereance for a tough ring discipline...it might have affected some people in the west for a period while(with the help of finance ,of course) with colourful foot protections , long satin trousers ,spin kicks etc...but,realistic people never considered this as a realistic ring system...even, at the birth times of fc there was a confusion between kyokushin people who were claiming that kyokushin is much more full contact form than fc(american boxing)...
(personaly, i had and still have the same impression and belief that kyokushin, ashihara is much more a full contact system than american boxing ...of course, this is my belief and there are lots of points which support this belief...)