I just sold my FAS604 for £165.
It was in good condition - and a Mk2, I believe.
They are excellent 10m target pistols - much better than the offerings from Gamo & Weihrauch.
Easy to service too - there's a good guide here - http://www.airgunforum.net/agf/index...howtopic=36654 - but you will probably have to register first.
Regards
sj