I generally buy whatever I want (guns and everything else), wherever it might come from, but if I can find something of equivalent (or better) quality and functionality that is largely made in the USA, then that would be and has sometimes been a good tiebreaker, even if it costs a little more. Generally I've not found price to be a major issue, though, perhaps surprisingly.
My home theater speakers, for example, are some of the best I've heard in their price range, and they're designed and assembled in the USA from largely European components (American audio companies that could supply such components were not willing to work with the designer, and probably would have outsourced to China anyway). For about 15% less money I could have bought something almost--but not quite--as good that was also designed by Americans but manufactured in China. It wasn't a difficult choice.
As for guns, most of the ones that I like and own or expect to own someday are made in the USA (mostly) anyway, so it's easy for me, too. When I decided to buy a polymer semiautomatic pistol for defensive purposes, I happened to like the M&P best, but if I had liked the Glock better or found it to be demonstrably superior, then I would have gone with that, as personal and family safety come before nationalism and my drop-in-the-bucket fistful of dollars. Regarding revolvers, I like S&W and Ruger, so that's another easy "made in the USA" choice for me. If I wanted a 1911, then there are still plenty of good domestic options, too. And finally there are a number of German-made guns that I'm interested in, as well, so I'll probably end up with one or more of them eventually, and I'm OK with that--they make some really fine weapons over there, obviously, and ultimately I'll buy whatever I want or need regardless of where it's made (with the USA favored in any tie between equivalent products).