I decided to have a longer cylinder on my BSA ultra se ,but after speaking to Carl from http://www.airtechrifles.co.uk/ he said i needed a shroud as well
ordered a 325 cylinder and a carbon fiber 28 mm shroud , well it came to day so got straight to it changing everything over .
The over all length of the ultra with the shroud , is the same as with a HW mod on a standard gun ,so no longer, which is good and just as quiet if not quieter than a HW mod . It's made the gun better balanced as well and should be able to get about 90 shots from a fill
May be not everybody's cup of tee to the looks of it
The first picture will show standard ultra with HW mod then photos with longer cylinder and shroud