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SAN DIEGO — A store that helps clients build their own guns is daring federal agents to raid their stores for a second time.

The controversial build-it-yourself gun store Ares Armor has once again started selling a questionable piece of equipment without the approval of the Bureau of Alcohol, Tobacco, Firearms and Explosives (ATF).

Its called an 80 percent lower polymer receiver, and federal agents claim the plastic gun part actually qualifies as a fire arm and is therefore illegal to sell. Federal agents raided the four Ares Armor store locations in San Diego County in March and confiscated its supply of 80 percent lower receivers.

“I don’t care what they do, but if they have a problem with it they can come and see me,” said Dimitrios Karras, owner of Ares Armor.

The business has been praised by gun rights advocates, but gun control activists say the business helps people build guns without having to go throught a background check.

“We are in complete compliance of the 1968 Firearms Act, and unless the ATF changers the laws their is nothing they can do about it,” said Karras.

Fox 5 attempted to contact the ATF for comment but has not received a call back.