The way I heard it Sig discontinued civilian sales for a time due to overwhelming military/government sales.
The SP2022 is not listed on Sig's 'discontinued' web page.
Story I heard is: the model designation 2022 reflects the year Sigs contract with French Special Forces expires. The 9mm version reflects the military requirements.
The 40s&w 2022 does not have many of the features of the 9mm 2022. I liked my 9mm so well I bought a 40, only to be disappointed.
O