The moderator arrived from Neil yesterday. I went with 10" long x 1.75" diameter. Looks great. Screwed on in place of the shroud end cap. I was just out back trying it. So nice! It is way quieter than I thought possible. Loudest noise now is the horrible ping. That will need to be cured. Moderator makes the gun pretty long but I don't pack it anywhere so not an issue. I gotta figure out how to post pictures.