Wal-Mart Stores Inc, the world's largest retailer, unveiled plans on Monday to film its gun sales in the United States and create a computerized log of purchases in a bid to stop guns falling into the wrong hands.

Wal-Mart, which is the largest seller of firearms in the United States, agreed a 10-point code, which also includes rigid inventory controls, with a bipartisan coalition of Mayors Against Illegal Guns led by New York's Michael Bloomberg.

The retailer said it will develop a first-of-its-kind computerized crime gun trace log that will flag purchases by customers who have previously bought guns later recovered in crimes.

"Wal-Mart currently uses a strong point of sale system," said J.P. Suarez, senior vice president and chief compliance officer of Wal-Mart. "This code is a way for us to fine-tune the things we're already doing and further strengthen our standards. We hope other retailers will join us."

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The Responsible Firearms Retailer Partnership is designed to strengthen the points in the gun purchasing system that criminals have exploited in the past, Wal-Mart and the Mayors Against Illegal Guns said.

According to the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives, 46 percent of its criminal gun trafficking investigations involved cases in which someone who is not legally allowed to purchase a firearm does so through the use of a proxy, known as a straw buyer.