It does have to be admitted that even with a 16.75 inch barrel (.25 inch longer than the US version), it's lighter than a IWI Carmel with a 10.5 inch barrel or a FN SCAR with a 14 inch barrel. Even the HK433 with a similar barrel length to the LB Bren 2 carbine weighs 3/4 of a pound more.
I don't know why CZ went with a longer gas system for the carbine, other than to discourage SBR conversions or to NFA SBR/AOW conversion kits. This, of course, doesn't apply so much to Europe, though.