Exporter, not producer. Concerning ammunition and missile production, Russia's existing military industry is outproducing America's military industry 26 to 1. I strongly recommend reading this article by the UK's oldest Think Tank.But, if the USA cannot make weapons, why then are they the largest weapon exporter in the world?
The United States in one year makes enough artillery ammunition for 2 weeks of combat with Russia.
In one year the United States produces enough anti-tank Javelins for 4 days and a few hours of combat.
In the Iraq-Afghan wars the US ran out of ammo and had to purchase from allies. That is against goat-herders. Unfortunately America's allies don't produce enough ammo either for a peer. The UK will run out of all ammo by the eighth day of combat with Russia.
Russia is not just using far more ammo, shells and missiles than the US expected they had, they are using them in Ukraine in quantities that dwarf all the production of Western nations combined multiple times over.
At a minimum Putin has somehow pulled off secretly building far more military industrial capacity measured in real ammo and weapons than the whole West has put together. Without the west knowing about it!
The US estimated all Russian industry to be the size of Mexico's in nominal terms. What every historian will be writing in two to five decades is that real production beats nominal production, and about the industrial strategy the Russians pulled off over 22 years to hide that much capacity.
For the sense of scale, Russian production vs Western production is even more extreme than the Allies were over the Axis. This is an industrial war, and such a war is lost by the West already. The question is whether the Nato-Nazis will use nuclear weapons again, and if their ranks will follow orders in launching. Even in that scenario, the West will die, while Russia will probably hold onto their heartland. No one has hardened their cities and population centers against nukes like Russia has. Those metros aren't just beautiful.