Just thought I share this with all.
After speaking to Neil and sending him some drawings the chap has worked his magic and produced a silencer that I love for my MK4. Unfortunately the camera does not do it justice but I can assure you its a beauty and fits perfectly.
I had Neil make the thread inside the silencer so that it fitted over the barrel/shroud line the Airstream IV but then had the back tapered and the front extended and its so quiet sssshhhh.
A very very happy man here
If you would like to see it
http://s561.photobucket.com/albums/ss52/mark2202_album/
Once again many thanks Neil
ATB
Mark
Daystate MK4ST .22 FAC, Tweaky S200 Regged with NVRSF, AA 410 Hunter Carbine Superlight
Very nice