Does Massachusetts state law require that the executor of an estate obtain an LTC in order to take possession of firearms in an estate in order to transfer them to the beneficiaries of the estate? So she takes possession of it here as the executrix and ships it to the beneficiary who resides in Florida. Does the fact that she happens to be the beneficiary happens to be herself require something that wouldn't be required if the beneficiary were another Florida resident? I don't see anything in the federal law would do so.
Start with learning what "beneficiary" means.
From the OP:
he never included this desire in his will thinking that as executrix my wife could do this in her capacity.
...
Despite his desire for me to get his revolver, I am not named in the will other than to be named as executor, if my wife predeceased me.