NRA slams push to track guns purchased with credit cards

The National Rifle Association is slamming the credit card industry's new effort to track gun purchases, describing the plan as "creating a national registry of gun owners."

The NRA is pushing back against decision on Friday from the International Standards Organization (ISO), which sets rules across the financial services industry, to create a new merchant category code for gun and ammunition retailers. ISO's decision comes after mounting pressure on credit card companies by Democrats in Congress who favor use of such a code. 

Merchant category codes are four-digit codes that describe the retailer where a purchase is made, without detailing the specific item bought. These codes allow credit-card issuers to track and restrict purchases — for instance, offering rewards credit cards that give bonus points for travel purchases or cash-back on grocery spending.