Good - Decent pistol - I'm liking the ability to swap the FCU to different frames, and different slides.
9mm, .40, and .357 Sig take the same sized FCU - the .45 FCU is larger, and only swaps with .45.
The trigger recall is pretty much done across the 320 line - you "may" find a NOS that has not been back to Sig, but it's still honored.
I've owned several 320s in 9mm and 40 - they have been 1-3 inch guns at 25 yards with most ammo.
Bad - it's a Sig - accessories are expensive IMHO - but they work.
The lower grip module has to be bought if you want a different grip size- most ship with the Medium - you don't get 4 backstraps with the pistol like a Glock or SW M&P.
It's not the most compact carry gun, there are smaller packages out there that will lower you "print".
Ugly - if you tinker with the FCU - Apex, Agency, etc - IMLE - you are more like to run into dead trigger or other issues if the parts don't quite fit.
Some of this - I believe - is the relative "new-ness" of the Sig 320 to the poly gun market.
Last edited by AH64guy; 05/04/20.
