Source - trust me bro. Have you seen the videos of Iran's underground missile cities. Tell me about missile stockpiles again.
US missile production is extremely, painfully slow. From Standard missiles used by the Navy to Patriot. From THAAD to PrSM. LRASM, Tomahawk, you name it, we have a Tiffany weapons arsenal. We're winning so much, we just put the F-15 back into production; a plane that entered service 50 years ago.
Historians used to mock the Nazis for continually developing wunderwaffe; while the Allies overwhelmed them with Sherman and T-34 tanks. Now we've become the Nazis (in so many more ways than one.)
Evidence? Genuinely curious. I read that for every ship the US can build, China can build 200. Our drones come from China. Have we got a magic tomohawk cruise missile factory that can be dialed up to the rate that China can produce? We have the raw materials pipeline and know-how still?