I've had a will for a long time and on the advice of my financial adviser have recently set up a trust. This includes power of attorney for medical and financial. I have a list of my guns with serial numbers, descriptions and accessories. The ones that I inherited or were gifted to me have that noted as well.
I have an additional note with the will offering advice on what to do with my lead and brass stash. Don't laugh, dealing with both will be something of a job!