Recently I visited the a-tec website and noticed the cmm moderator. Only 220 grams but still adding 16cm ( about 6 inch) to the barrel. Most moderators are tremendously heavy, about 500 - 600 grams. Other models are "over the barrel " types wich only add about 2 inch in overal lenght. Moderators are not "common" here in Belgium and illegal. So I don't know much about it. Is there a model wich is light and short ?