Payment options when buying a firearm

This fits the money board better, but it is probably beneath those snobs. Plus it regards a firearm so it belongs on the OB.

With the tax free weekend fast approaching I have been thinking about firearms I would be willing to buy if a good opportunity were to arise. FYI I am considering an 870 tactical or classic as well as a ruger sr40c. In the process of buying said firearm I would also like to build a little credit. As a recent college grad who only has one credit card with no balance and no student loans it wouldn't hurt to deepen my credit history.

If I were to choose an alternate method to paying up front, would it be better off to buy my firearm with my credit card or with in store financing? My credit card has a typical first card high interest rate. I have plenty of money if I wanted to buy up front and I am not going to buy a gun just to build credit. If I were to put it on my CC, would it do me any good credit wise to pay it off the same month? Should I finance it with 0% for as short a period as possible or as long a period as possible? What is the best was to build credit in the process? It goes without saying that any payments I agree to make I will pay on time. Thanks