I intentionally use cash when making a gun purchase. First, SWMBO pays the credit card Bill's, and the leas she knows the better
Honestly, while I know .Gov knows what I buy and when I do, I don't need the credit card company, the bank, the credit bureaus, etc. knowing that. My business. (A bonus, LGS will usually give me a discount if I'm paying cash, as he avoids the CC fees.)