These are links to a couple of videos I put together with the owner of Tactical Response to demo XS Big Dot sights.
This one shows how XS sights work at distance.
XS Sights Out To 100 Yards
This one shows what a proper sight picture should look like with XS Big Dots.
XS Sights Up Close and Personal
nice vids. It seemed like the gun was shooting low. Is this common w/ the XS sights?