Sorry I missed this thread the first time round, LSHopper. DPCD on the AR forum went through this same problem last month. He got no satisfaction from CZ USA, so he ordered a 602 spring from Wolff, which he was then to shorten. That suggests that it's do-able, since Tom seems to know his stuff. Be advised, however, if you're going on AR with anything relating to Brno/CZ: Be sure to wear your athletic cup. You're going to be subjected to the usual American rants about the "dangerous" and "backward" CZ safety that's responsible for countless deaths and orphaned children every year.