I have often wondered why pollster don't regularly ask this question: Which party is closer to you on gun control? It turns out that The Economist/YouGov poll did ask this question for a while during 2010. Does the double digit lead that Republicans have over Democrats on this issue explain why gun control isn't included when pollsters ask about everything else from the economy to health care to foreign policy. Here are the results that I found for 2010.
The Economist/YouGov polls from other points in time is available here