Receivers are the same, barrels are the same, rib heights get progressively higher as you go from the 2000 to 2005 and to the 2008. The 2008 is pretty darn high. The 2008 only comes in an over/under so far. The 2000 and 2005 come in combos or a single barrel.. The higher ribs are favored by some by keeping the head more erect. I haven't shot at 2008 but the 2000 and the 2005 are great guns. The stock demensions are different on all three also...