Colorado does not (as far as I know) issue non-resident CCW permits. All the same, a Washington State resident applied for one because the two states don’t recognize each others’ permits. He was denied a Colorado permit and sued. From Fox News:

A federal appeals court has ruled that permits allowing people to carry concealed weapons are not protected by the Second Amendment.

The ruling by the 10th U.S. Circuit Court of Appeals was issued Friday in a case involving Washington state resident Gray Peterson.

A federal judge in 2011 tossed out Peterson’s lawsuit filed against Denver and the state’s Department of Public Safety. Peterson claims that being denied a concealed weapons permit because he was not a Colorado resident violated his Second Amendment rights to bear firearms.

More at the link.

Of course, this latest ruling somewhat contradicts this one:

A federal appeals court on Friday narrowly rejected Illinois’ request to reconsider a ruling that found the state’s concealed carry weapons ban unconstitutional, leaving lawmakers in the only state that still prohibits concealed carry grappling with how to proceed.

Granted, the cases are slightly different. At the moment, a resident of Illinois cannot get a CCW permit from his/her own state. The Washington resident can. He just can’t get one from Colorado, where he doesn’t live.

Obviously, this pushes the case that a CCW permit from any state should be valid in any other state (like a driver’s license) but I worry that if the permit process is hammered-out by Congress, the states with the most representatives will get their way. That would be some of the most restrictive gun control states: California, NY, NJ, Illinois, etc. Residents of “shall issue” or “constitutional carry” states could be screwed.