For more on Romney and guns see this.

I’ve lived in Mass for 20 years and seem ‘em come and go, and I can tell you that your analysis is absolutely on target. Mitt Romney has changed his positions so often on so many issues that there’s a standing joke about it.

1st Guy: Where does Mitt stand on issue X?
2nd Guy: What day is it?

Talk about bending whichever way the wind blows, Mitt doesn’t wait for winds – a light breeze is good enough. Most people I know don’t think he has any principles, convictions, beliefs, or honest positions to speak of. What he says depends on who he’s saying it to. Rod’s obviously buying the latest version (which would be somewhere around v720.0) but it’s only the latest in a long line.

Everybody here knows that at this point, and that’s why he’s not running for re-election as gov – the polls say he wouldn’t have a chance. Nobody trusts him any more and he’s burned all his bridges behind him.

I don’t want to tell Republicans what to do but can’t they do better than this? Of course, there’s one good thing about him: he’s relatively harmless. He didn’t do anything as Gov and he wouldn’t do anything as Pres. Maybe that’s a recommendation.

Romney tells Massachussetts voters one thing, now he’s telling GOP primary voters another thing, and he’ll probably tell general election voters another thing completely. He has no business running for elective office because he has no core principles.

* “Americans should have the right to own and possess firearms as guaranteed under the U.S. Constitution. I’m proud to be among the many decent, law-abiding men and women who safely use firearms.” – Governor Mitt Romney, 01-12-2007, Presidential Candidate Mitt Romney Visits Firearms Industry’s Trade Show

2005

Also, in 2005, Romney designated May 7 as “The Right to Bear Arms Day” in Massachusetts to honor “the right of decent, law-abiding citizens to own and use firearms in defense of their families, persons, and property and for all lawful purposes, including the common defense.”
2004

* “Deadly assault weapons have no place in Massachusetts. These guns are not made for recreation or self-defense. They are instruments of destruction with the sole purpose of hunting down and killing people.” Romney said, at a bill signing ceremony with legislators, sportsmen’s groups and gun safety advocates. 07-01-2004 Press Release

* “By making this common-sense change to the law we will enable target pistol manufacturers to do business in our state and allow enthusiasts to practice the sport they love.” – Governor Mitt Romney, 07-01-2004 Press Release
* “Mitt Romney supports the strict enforcement of gun laws. He is a supporter of the federal assault weapons ban. Mitt also believes in the rights of those who hunt to responsibly own and use firearms.” – http://www.romneyhealey.com/issues/, no longer active, see Web Archive
* “Stun guns have proven time and time again when used by law enforcement officers in other states that they are an effective tool in stopping suspects. It is high time for our men and women in blue to utilize this modern crime fighting technology.” Governor Mitt Romney 07-15-2004 Press Release

2002

In 2002, even as he was pledging to uphold the state’s strong gun laws, Romney still garnered a “B” grade from the NRA.
Governor Mitt Romney and Firearms Policy Press Releases
2004

07-01-2004, Romney signs off on permenent assault weapons ban

* The bill enjoyed the support of Massachusetts gun owners because it also encompassed several measures they favored — including a lengthening of the terms of firearm identification cards and licenses to carry. (Asked about the bill Friday, Romney described it as a “consensus measure” and a “positive step.”)

2006

07-26- 2006, Governor Romney Approves Exemption for Target Pistols
2006

01-12-2007, Presidential Candidate Mitt Romney Visits Firearms Industry’s Trade Show