One U.S. Navy veteran's north Alabama business is celebrating Independence Day with an unusual special: a free AR-15 with every new roof. Yes, it's legal.

Digital Roofing Innovations is making quite a splash with its early marketing campaigns. The Decatur-based business has only been around about a year. A July 4 ad promoting the special on Facebook had been shared more than 400 times in its first six hours online.

"Donald Trump says make America great again. I say make America gun again. MAGA!" Owner Zach Blenkinsopp says in the ad, shirtless, wearing cowboy boots, an American flag hat and short star-patterned shorts while holding an AR15. "Some of you might be sitting there saying, 'Man, this sounds like a gimmick.' A gimmick you say? Well I'm a gosh darn Navy veteran, active duty eight and a half years. My roofing company's not a gimmick and this baby's not either. It's here to protect you and your family."

Blenkinsopp, a Florence native, served in the Navy from 2004 until 2012. He's seen companies elsewhere give away free guns with purchase, but he's never seen it from a veteran-owned company. The company also offers military discounts.

"Any red-blooded, right wing American, when they see that, it's going to give them a little extra incentive," Blenkinsopp told AL.com.

It's not really just AR-15s. After the roof is completed, the company gives each customer a voucher that can be redeemed for either an AR-15, a pistol, a hunting rifle or a $500 gift card good at Cypress Creek Indoor Range in Florence. Customers have to go through all the regular legal channels they would to buy a gun at any other brick-and-mortar store in Alabama.

The promotion - for now, only available to roofing customers in Alabama - is ongoing for the foreseeable future, Blenkinsopp said.

Blenkinsopp comes from a digital marketing background, and his business partner is a former commercial real estate appraiser. He's not particularly concerned with potential backlash to the ad. Despite how some viewers might interpret the ad, he said both he and his partner are very open-minded people.

"I've traveled a lot outside the U.S. I've got tons of gay friends that identify whatever way they do," Blenkinsopp said. "Even though in the video you might picture me as a backwoods redneck, me and my partner are well-traveled, educated guys."