I don't know a lot about the American Classic line. I seem to recall that they seem to be pretty well regarded.
As for the spring, I'd normally say "Check your owner's manual." However, having taken a look at at it, I didn't see mention of it. IIRC, the short barrel models should be swapped every 2000 rds, or when noticeably shorter than a new one, whichever occurs first. Changing out a $6-$8 spring every so often isn't really a big deal.
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Last edited by Overkill0084; 10-04-2012 at 02:55 PM.