Thats a standard P6 barrel with a threaded barrel extension. David had originally put a wide shoulder on it with flats so it could be removed and the barrel could be removed from the slide. I removed the extension and chucked it up in the lathe and turned the shoulder off to the OD of the barrel. Then I silver soldered the extension permanently onto the barrel. Now I can remove the barrel with the threaded section in place and there is still enough shoulder for the silencer. Feeds ball nose subsonic 147 grain ammo 100% which is all I need for suppressor duty. I have one of the Barsto barrels on order but just in non threaded standard length. Even with all the barrel work done to the original P6 its still probably the most accurate centerfire pistol I own.
