If someone doesn't support 2A rights, then supporting their business supports their lifestyle, and I for one don't want to offer financial support to someone who doesn't support my 2A rights.
I've never owned a UtiliKilt, but have seriously considered buying a few. They are well-made, comfy, and VERY utilitarian. I do own a few SportsKilts, which are a little more "flashy" being made of plaid material (rather than the rugged canvas of the UtiliKilts). But I had planned to buy a UtiliKilt or two in the future.
I've never heard anything about them being anti-gun. If they are, I won't buy their products. If they support our rights, I will gladly write them a big fat check in the future, because I have always been VERY impressed with the quality of their products. Plus, they are made in the USA!