Trappa,
Check out A-Tec moderators. I own two in .243 and .308 and have never seen anything similar. Even friends who would not be swayed easily are now believers. It is very light, at only 500g, and fully stripable. All beautifully CNC machine made, to the point it is a shame to put anything through it! Check them out at http://www.a-tec.no/lyddempere.html
There is now a UK importer. When I first bought mine they were some of the very first in the country. Had to wait about 4 months for the toys, but the wait was well worth it.
Good luck.