I was browsing through the Kahr website and came across a ported 4" barrel they sell for certain pistols. I have a K9 and it's available for this model. The stock barrel is 3.5" and obviously not ported. What advantages does one see when switching over to the longer, ported barrel? It mentions less recoil with this barrel on the website. It's not enough to hurt conealability, so I'm thinking it might be a good idea. Anyone have any input?