I read this thread:https://sigforum.com/eve/forums/a/tpc/f/430601935/m/5080045094
and the latest entry was last March. Just wondering the latest thoughts on the topic. Picking my 322 up in about an hour. I will not be rushing to get an optic but will be "looking".

It is the Holosun 407/507k footprint along with the Romeo Zero stuff, RMSc, or whatever.

My recommendation is the 407/507k’s. If you want a dot get the cheaper 407, if you want the reticle options of dot, circle, and dot and circle get the 507. Green or red your choice.

I think they are the sweet spot of this size class. And a side loading battery. Click adjustable. Backup up rear sight built in. They are the class of the division.

^^^^^^^^^
What he said. The Holosun is very nice on the Sig P322, especially with the side control buttons. The Sig Romeo zero & Elite is very nice also except the contol button is hard to manipulate and a little frustrating due to its location. Enjoy.