According to the official Spanish Army magazine in the june, 1940 issue, these are the figures about guns and ammunition captured to the Republicans until the end of the war (april 1939):
Artillery guns 1.877
Artillery projectiles 3.683.086 (not counting the ones destroyed)
Machine guns 25.306
Rifle cartridges 1.136.260.000
Hand grenades 2.475.883 (not counting the destroyed ones, some ten millions)
Explosives 3.516.208 kilos.
There were 60 different cannon and howitzer models, 49 different rifle models, and 41 different light and heavy machine gun models.
The above figures do not count the guns and ammunition that the capturing units kept for themselves.
1.136.260.000 rifle cartridges… now that’s some serious surplus to be sold in the US market…