This has some of the astonishing figures of the US in manufacture and expenditure. I am unable to find a better one I have however I will keep looking.
http://www.grolier.com/wwii/wwii_16.html
An example while coping with production of all other aircraft!
3,898 B-29 Super Fortress Very Heavy Bombers
Or
Year .50 Caliber(1) .30 Caliber
1940 5,155 3,633
1941 49,479 27,672
1942 347,492 314,839
1943 641,638 188,311
1944 677,011 121,771
1945 239,821 62,977
(1)The increasing preponderance of .50-caliber machine guns reflects
their growing use as aircraft and armored vehicle armament.