I was just at the local Wal-Mart. I noticed that they had several Remington shotguns with 28-30 inch barrells that were ported(correct term? Two groups of small holes near the top the barrell near the muzzle). I know I have seen comments on this type of barrell somewhere on the board, but I can't find them. What are the advantages/disadvatages for this type of barrell. I am looking at getting a longer barrell for sporting clays and for hunting season. Opinions plase. Many thanks in advance.