I have this pistol and have done some extensive testing.
You will need this adapter.
The #S61 Sumo quiets it the most, but it blocks the sights.
https://donnyfl.com/collections/ldc/products/1-5-x-6-5-inch-sumo?variant=33070855487531
The #S69 Tanto gives you a clean view down the iron sights, but leaves the pistol a little too loud for my tastes.
https://donnyfl.com/collections/ldc/products/1-22-x-5-inches-tanto?variant=33070828126251
The #S57 FX branded moderator does a good job on the sound and still leaves enough of the sights visible for them to be useful for pest or target work.
https://donnyfl.com/collections/ldc/products/1-36-x-5-inches-fx-donnyfl?variant=31884926648363