$750 a piece for a used XD? Yikes, you should be able to find great deals under $500 NIB. I don't know about the Mass compliant issues, but at first glance this guy is trying to scalp you, unless he has a boat load of magazines to throw in and can explain the cost of the so-called upgrades or customization he has performed. I believe just maybe depending on their condition $750.00 for both with the extra mags' would be fair depending on the condition. Sounds odd he went from $400 to $750.00 a piece in my mind. Are you sure he doesn't want $750.00 for both?