It seems to me that Romney's position on gun control, assault weapon bans and existing law is rational. I don't think this should be a make or break issue for anyone considering voting for Romney. There are much more important issues to deal with, especially the economy.
From the Washington Post:
"Former Massachusetts governor Mitt Romney has actually been more active than Obama on gun control — albeit during his time in Massachusetts. Since leaving office, he has moved away from those positions.
While running for Senate in Massachusetts in 1994, Romney supported background checks and a ban on some assault weapons. “That’s not going to make me the hero of the NRA,” he said. Running for governor in 2002, he said, “We do have tough gun laws in Massachusetts — I support them. I won’t chip away at them. I believe they help protect us, and provide for our safety.”
As governor, in 2004, signed an assault-weapons ban in the state. However, that law won support from some gun-rights advocates by making it easier to get and renew a firearms license. Romney also raised the state’s gun-registration fee from $25 to $75.
Romney joined the National Rifle Association in 2006, a few months before launching his first presidential bid. “I’m a member of the NRA and believe firmly in the right to bear arms,” he said in 2007.
Pressed by NBC’s Tim Russert on the issue that year, he said, “I support Second Amendment rights, but I don’t line up 100 percent with the NRA. They take some positions that are different than mine.” He continued to support the assault-weapons ban, reaffirming that position in a 2008 debate.
However, in a subsequent interview with conservative bloggers, Romney said, “I don’t support any gun control legislation, the effort for a new assault weapons ban, with a ban on semi-automatic weapons, is something I would oppose. There’s no new legislation that I’m aware of or have heard of that I would support.”
Romney’s position has not changed notably since. In a recent speech to the NRA, he said, “We need a president who will enforce current laws, not create new ones that only serve to burden lawful gun owners.” He suggested that in a second term, Obama would do more to restrict gun rights.
But neither candidate seems poised to change current gun policy. Just as public opinion on gun control does not shift in the wake of such tragedies, both Romney and Obama are likely to play it safe."