CHICAGO (MarketWatch) -- Retail merchant account provider MerchantService.com will give a voucher good for a free AK-47 assault rifle to new customers, depending on the amount of business they do. The company, which provides credit-card-processing services to businesses, announced the promotion as part of its ""No Merchant Victims" campaign that is designed to "encourage merchants to stand their ground and protect themselves," MerchantService.com said. The voucher, worth up to $750 "can be used at any reputable gun shop where [the user] must go through the proper background checks and waiting period that the law requires," said Gino Kauzlarich, president of Sarasota, Fla.-based MerchantService.com, on the company's website.