I have chance to buy 28 gauge Flues #326830 and man said it has woodcock on frame and fluid steel barrels. I guess it is #2 grade. How many 28 gauges were made and what chamber length would this gun be? Are 2 1/2" 28 gauge shells available and where if this gun has short chambers? Is it safe to lengthen chambers? All info i can get on this gun will be appreciated! Bobby