Think about it for a minute - who makes pistols in the US?
Glock's biggest production facility is in Georgia, not Austria
FN makes machine guns and rifles in South Carolina
S&W makes guns in Mass and other places
1911s can be made from imported parts, like Taiwanese or Canadian castings
SIG has a huge plant in New Hampshire
Remington makes their guns in a variety of plants in the US
CZ-USA is based in Kansas City and has an operating plant
Beretta moved to Tennessee
Browning makes their guns in Portugal or Japan but is HQed in Ogden and Montreal
The only big pistol company that isn't somehow making guns in the US is H&K. And I doubt H&K is getting any US contracts due to their issues in Germany with them selling guns to drug lords and how their main battle rifle isn't preforming up to expectations. On top of that, "American" brands aren't always 100% American.
H&K supplies the USMC with the IAR