I don’t think they are making new ones. They are manufacturing the old ones.
They are still making them.
The line almost closed during the Clinton years but, the Egyptian buys kept it open.
The current remanufacture program for the US Army is 110 M1A1s being remanufactured to M1A2 per every 30 completely new M1A2s.
Then there is the foreign sales to Egypt, Saudi, Kuwait, etc...