I believe on gungallery.com is one sight a friend of mine told me they are on. You have to check with a local dealer right now to see if they have them. I don't know what the change in dimensions are. The barrel is the same length and the ambidextrous safety is not offered as on the G21SF. The overall grip circumference is smaller for those with smaller hands. I am waiting to see them side by side at my local dealer to make a choice as well.
