Cristina Acidini, the superintendent of the State Museums of Florence, claimed the image of David is copyrighted to Italy, according to CNN.
In a statement posted on Ammoland, the company expressed regret for any offense the ad caused and said the company ownership has changed since the advertisement was posted.
Mark Johnson, the company's chief executive officer, said on Ammoland he considered the ad "in poor taste."
Michelangelo completed the marble masterpiece David in 1504, and it is considered one of his most famous works. It depicts the future hero and future king at a pivotal moment, clutching the stone and with a sling over his shoulder as he contemplates his upcoming battle against the larger Goliath.
The original can be seen in the Galleria dell'Accademia in Florence, according to the Michelangelo Gallery online, and copies abound throughout the world.
For a closer look at the work of art, visit Stanford University's Digital Michelangelo Project, which, unlike the ad, includes the statue's full-frontal nudity.
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