Do you even know what "mass production" means? It doesn't mean thousands in a month, it means a couple of dozen at best, if not less a month.
They're not pumping out cheetos, they're manufacturing sophisticated military systems; just a single system not only costs a shit ton, but takes a shit ton of time to build just 1, and then they have to build enough and ship them out.
All of this takes time and money, both of which Russia doesn't have as the invading party.
Once again, don't talk about these things if you dont have a clue what you're talking about, you'll get made fun of.
Russians and their boot polishers are living in a grand delusion of their own design, and when reality snaps back into their minds, that'll be the end of their little make belief.
Russia doesn't have stockpiles ready, if they did they would have used them on a mass scale by now.