Do these insurance plans cover travel and other scenarios such as home defense? Do they have pro 2A lawyers on retainer in Hawaii?
The NRA policy covers you and your spouse outside the home if you both can legally possess firearms and can legally CCW, which applies to traveling. Any other resident in the home that uses a gun legally or justifiably is also covered. So, kids, grandpa, or whoever else living there who has access to firearms is covered inside the home.
USCCA only covers the policy holder outside the home. Spouse, relatives and kids under 21 under your care are covered inside the home. Spouses can become USCCA members to be covered outside the home at a discounted membership rate.
WEAPONS OF OPPORTUNITY
One thing I didn't mention before. USCCA covers any type of legally owned firearm
and any other weapon you might use: knives, tasers, bats, pepper spray, or your hands.
NRA only covers defensive use of guns.
INTENTIONAL ACTS
Almost all homeowners and umbrella policies you already may have likely exclude "intentional acts." Makes sense, because they won't cover arson or shooting someone regardless of justification.
Therefore, when you defend yourself with a firearm, it's considered intentional. These policies will likely deny any claims under that clause in the policy. So, having a policy that is specifically for DGU is not likely to duplicate other liability policies you might already have.