The owner of a California store that sells gun parts to build rifles from scratch is refusing to turn over his customer list to federal officials.

Dimitrios Karras, owner of Ares Armor in Oceanside, told Fox5SanDiego.com that Bureau of Alcohol, Tobacco, Firearms and Explosives agents are investigating his business because it sells AR-15 lower receivers, which contain the gun’s operating parts.

The company sold thousands of 80 percent receivers in with colors showing where the customer can drill, making it easier and cheaper to build. The ATF said the sales are illegal and demanded the company turn over the products and names of customers who purchased them, according to the report.

“They said either give us these 5,000 names or we are coming in and taking pretty much anything – which is a huge privacy concern and something we are not willing to do,” Karras told the station.

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