This confuses me. They share the same lines. The fixed sights of the XS follow the profile of the adjustable on the S. The cylinder is fluted and has the ejector rod cutout to get below that magical 16oz mark. Cylinder flutes are pretty standard and many of the fancy models from S&W have the little window cutout for the ejector rod to look cooler. They take the same grips from what I’m told and have seen so far. I will confirm they fit the same holsters once usps graces me with my package from Tom. The build quality looks good on the couple samples I’ve seen. Truthfully the only part of the gun that looks cheap is the shitty paint in the front sight.