You're going to have to focus on one area. And the 15-year-limit sounds kinda arbitrary?
In any case: 1987 marked Florida's conversion to shall-issue CCW. I have a short but interesting article on what FL was like before that at:
http://www.ninehundred.com/~equalccw/howardpearl.html and you should also note Clayton Cramer's comments in "The Racist Roots Of Gun Control":
http://www.federalobserver.com/archive.php?aid=3312 - esp. what Judge Buford had to say in Watson v. Stone 1941 FL Supremes.
Why does Florida matter? Because while "shall-issue" CCW systems had existed earlier (Indiana, WA State, others) FL pioneered the idea of linking the permit to a state-standard and mandated training course of 8 hours. Linking the gun carry permit to mandatory training proved to be THE key to getting it past state legislatures and we then managed to convert AZ, OR, VA, GA, TX, OK, UT, MI and scads of others, all with mandatory training of as little as 5 hours, as much as 16. You'll need to track down the dates of conversion, I think
www.packing.org can help there.
Point is, if you concentrate on Florida's 1987 statute and show how it was copied, you have the story of how the pro-gun side's greatest successes have come. I can show you newspaper articles talking about the net effects of this sort of law:
http://www.ninehundred.com/~equalccw/ccweffects.html
Email me for a pile more:
[email protected]