Think about how a ported barrel reduces muzzle flip. It sends the hot gas and debris from the round being fired up out the top of the barrel to keep it from flipping. Now, put yourself in a SD situation where you are shooting from retention or at night. Where are the hot gasses and debris going? Right at you potentially causing injury, and at night it can seriously affect your sight as the muzzle flash will be greater than a non-ported model. IMO, ported for range-only guns and not guns for SD.