I can't imagine gun manufacturers being too happy about possibly having to make all new magazines specifically for NY state.
Honestly most probably wont make them. I live in Massachusetts where to buy a gun in this state it needs to be certified. To be certified in this state is a huge hassle, and since Massachusetts is such a small percent of their revenue alot of companies do not even do business with Massachusetts. I suspect some companies will drop NY completely and choose not to do business with them.
Our government is full of simple minded fools, I cant even express how disgusted I am. The major crisis in this country right now is our economy. All this gun control spiel if passed will put countless people out of business and countless people out of jobs. In a time where our country needs every penny it can get, they are doing their best to shut down an entire industry.