Here are some constants:
>You can have a MA resident LTC, Sorry I don't believe there exists a non-resident LTC in MA. However, there are some who can speak to this.
>You can apply for and possess a FL non-resident LTC. It's not a difficult process.
>You can apply for and posses a FL state ID--it's not a driver's license, it just lists your FL address and a photo. They're pretty easy to get. Just bring a birth certificate, a tax or utility bill, and pay the fee at the local RMV. IF YOU PLAN TO PURCHASE A FIREARM IN FL, YOU'LL NEED YOUR OFFICIAL ID (A DRIVER'S LICENSE OR STATE ISSUED ID, THIS IS IT)
>The FL state ID is handy if you should get carded for liquor or when you use a CC. In North FL, you can get some screwy looks when you show a MA license
>If your driver's license is in MA and you elect to keep it, you can register a vehicle in FL. If you want to keep there, it's very legal. However, if you bring it here part of the year do expect traffic stops more frequently if you drive it in MA "off-season". Especially with blacked -out windows.
>If you're traveling by air between the two states, be sure to tell the airline Ramp Agent (ticket counter) that you have a "declared firearm " in your checked luggage. Read the airline's rules before you travel. these are usually on their website. Avoid stopover's in PA, NY, & NJ where you receive your checked luggage.
> Travelling by vehicle, from D.C. north, I'd seek an alternate route. Transferring the firearm home and back would be cheaper than the bail and legal fees. Remember, with a long gun, you can just ship it to yourself between addresses via UPS.
>When travelling, always carry both ID's and LTC. Your FL non-resident LTC is good in 33 states. Your MA LTC is good here.
>You can buy a firearm in FL with the appropriate CCW Permit (FL's LTC) and an official ID. It's legal to bring it to MA.
> You can't buy a firearm in FL and sell it in MA without first registering it here.
> Lastly, there's a comprehensive book available about FL Firearms Law by Jon Gutmacher,Esq. If George Zimmerman had read it, there wouldn't be a State of Florida v. Zimmerman.
Best of luck