I think mine ended up being a couple inches longer than stock but it is quiet, very quiet. The original design of the offset moderator just isn’t a great design for a .25 or .30. I added a third aluminum insert to the original and extended it a few inches but the air is still directed out the barrel and not deflected out the side holes, so there was no improvement. Finally went over to Neil’s one afternoon, he took some measurements, we talked it over and then he just decided to keep my gun for a few days to make a couple versions to see what worked best. He gave me the one that was quietest and I couldn’t be happier. You’ll be happy with it, Neil makes great moderators.
Have a good one. Stoti