Tracking gun sales

Over the past few months the groundwork has been laid so that gun store purchases can be tracked. Not tracked by the government but rather by the card brands (American Express, Discover, MasterCard, and Visa). It is worth noting that this will not make it possible to determine what exactly was purchased, but it will convey how much was spent and by whom. Some argue this can help law enforcement spot suspicious transactions, whereas others see this as a path toward curtailing Second Amendment rights. So why is this happening? The card brands have all made statements that they support all legal commerce and don’t want to affect any purchases. However, their hands have been tied because a new merchant code was created specifically for gun stores and now they have to comply with the gathering of data; there is a merchant code nearly every other business type. Do you have any thoughts about this?