Romney because if Barack is re elected he will be able to appoint two new Supreme Court Justices, there are currently a ton of gun cases backed up waiting to go to the SCOTUS, and with both the Heller and McDonald cases being decided in favor of guns by a margin of 1 vote you can see which way it would swing in future cases, and with Barack suggesting a new AWB as well as a new "Saturday night special" ban of "cheap handguns" in the last debate there will be more cases, possibly ones that could last for forty or more years due to the lifetime or retirement Justice privilege. yes I admit it was a very specific and limited reason to vote for Mitt, but its an important one for me.
voting for either of these establishment hacks is a losing proposition for more than just guns in the long run i believe. a vote for Obama is like backing up the Titanic after it hit an iceberg to hit the same iceberg again. a vote for Romney is like hitting an iceberg and steering it into another one.