For the Sig-320 models that are currently in stock, there are sub-compct models available in .40 that have a 10+1 magazine. The .45 models will have a 10 round capacity but for the 9mm models, they all have what CT considers to be a large capacity magazine. Sig does make certain 320 models that have a 10 round capacity in the 9mm, But it does not appear there are in currently in stock. There are models of the 239 and 938 that fit your magazine criteria and even other P-series Sigs.

Hi Kenneth the sig p320 compact has a 12 round mag so it would not be compliant with CT laws regarding 10 round mags or less. In CT mags that have a capacity of 10 rounds or more are considered high capacity mags and are baned. more info on CT laws can be found at smartgunlaws.org