I think these have got to be the best moderator around; http://www.thirdeyetactical.com/thirdeye_website2_006.htm
It can be bought as both a muzzle can or a reflex, and it weighs 50g more than a Roedale muzzle can. Used as a reflex this leads to negligeable weight in front of the crown, which gives a much better balanced rifle than any other mod on the market, other than a Bowers custom.
Simon
Ah Simon, but that weight is for a Rimmfire mod isn't it?
CF is over 400grams.
Very hard to beat the Roedale or A-tec design, maybe impossible if you double the outside wall section.
edi
A brilliant solution, thank you 
