In September, Visa, Mastercard, and American Express all said they would adopt the MCC code to categorize sales at gun shops; months later, several social media posts of alleged gun stores and customers claim they experienced card issues.   

Twitter account "Battlecock Tactical" tweeted, "Federal Firearms License [gun shop] in a Facebook group shared this. Looks like the doomers accurately called how that new firearms merchant code would go down." 

Battlecock Tactical's images show what appears to be a retail POS system at an FFL that reads $913.70 transaction was "declined." The error code on the merchant's computer read: 

"Transaction declined: Charge declined RESTRICTED CARD Customer bank does not allow this card to be used at this type of merchant." 

Another picture from the customer's view had the same error message. 

Battlecock Tactical's tweet had what appears to be another FFL by the handle "3dprintfreedom.com" who replied:

Holy shit. This might explain the random card issues we've been having.

— 3dprintfreedom.com (@YouMayCall_Me_V) December 8, 2022