I am trying to put the successful passage of a National Constitutional Concealed Carry Reciprocity Act bill into practical practice compared to what is currently required:
Having a CCW (by whatever your home state calls that) honored by non-resident state(s) that you visit which, not all honor yours currently.
If you endured obtaining a CCW, did their checklist, endured a fingerprint criminal background check, and passed that;
Then you have the determination to do what is essentially a paper chase to get a REAL ID for federal purposes like passing a TSA security checkpoint, and quite possibly buying a gun.
The reason that I think that will be the new standard in place of showing a CCW, at a point of sale, at a firearms dealer store is that I think that will be adopted as the standard for the sales clerk to run a quick NCIC check to be sure that you are not a prohibited person, like a fugitive barred from purchasing a firearm, in place of showing a CCW.
If you can get a CCW, you can get a REAL ID, to buy a firearm.
It’s not a firearm registration, in fact less so than a CCW.
Just like showing your DL to prove you are legal to buy cigarettes, or alcohol, only for firearms in this case.
The REAL ID 
DL is harder to forge as it has more tamper evident features, and requires more stringent standards to obtain than a standard DL/ID.
We are not there yet, one of these bills has to pass the legislative process, and get signed into law.
In the meantime we have a patchwork quilt of nearly two-thirds of the individual states that passed their own Constitutional Carry Permitless laws pending the remaining states doing the same.
And, we know that there will be those stick in the mud blue states like California that won’t do that.
So, we need the passage of a National bill that won’t give them the option to opt out.
Once that happens, state issued CCWs won’t be required, although good until they expire, won’t be needed for an interstate traveler to prove reciprocity, or to buy a firearm.
Although, I expect they will still be acceptable until phased out, or expired.
So, what will be required?
I think that it will be a universally, readily available, and acceptable form of ID like a state DMV issued DL, or ID.
I strongly suspect they will want that to be the REAL ID vs. standard version.
For all those who don’t now have such an item, think about getting one.
Stage 1- get at least your DMV’s checklist, and take inventory of what you have vs. need to get.
Then set about contacting any agency for a needed birth certificate to show DoB, and lawful presence in the US. or marriage certificates, etc. to show name changes, with acceptable seals, either raised, or multi color micro printed tamper evident seals not previously required, so you may not have that.
The bigger municipalities like NYC don’t do raised seals as that is too labor intensive for the high volume that they deal with, thus they go with the printed seal as described above.
Each entity has their own process, requirements, and turn around times, some not as swift as others ether because of the high volume of requests, or podunk lacks the staff to handle their requests.
So, when you discover a needed item, request it, and wait for it, check it off your list, and repeat as needed.
Maybe by the time a National Constitutional Carry Act becomes fact you might have all your ducks in a row 
.
And, beat a backlog rush like flyers are dealing with now who have yet to get theirs previously.
Boy Scout Preparedness 101, or military NCO Academies, don’t wait to be told, have some foresight, take some initiative, beat the rush.
, and Global Entry that offer their Identification, and expedited security screening lanes at airports, and ports of entry.
Related video: Bozeman airport officials remind travelers of May 7 deadline for REAL ID (KBZK Bozeman, MT)
sooner than later.
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as stated a standard DL / ID is still good for purchases of ATF: Alcohol, Tobacco, and Firearms, no REAL ID required there yet.