Home Forums Hunting & Shooting Gunsmithing Lengthen a shotgun barrel?

Howa, Smith & Wesson 3000, and Mossberg 3000 are all the same shotgun. Here's a S&W barrel, not sure if it's a 3000, but might be worth checking into:

http://www.gunbroker.com/Auction/ViewItem.aspx?Item=226945749