Hawaii is one of the most liberal states in the nation and is run by liberal Democrats. As a result, Hawaii has some of the strictest gun control laws in the country. If you bring in a firearm you have to register it within 72 hrs at the police department in Honolulu. The registration process can take many hrs of waiting. They make it so painful that it's just not worth it. The only way I would ever bring a pistol, rifle or shotgun to Hawaii is if I was 100% certain I would be in and out in less than 72 hrs so that I wouldn't have to register it. Muzzleloaders are exempt from the registration requirement. I did bring my muzzleloader one time for an axis deer hunt, but the issue is that you can't bring powder with you on the plane and loose powder or pellets are very hard to find in Hawaii. So, unless your outfitter has powder or pellets then you are wasting your time bringing a muzzleloader.