www.bushmaster.com/faqnew/content_by_cat.asp?contentid=205&catid=103BARREL WEIGHTS...
For informative purposes (and because we answer these questions all the time!) here are the comparative weights of our barrels.
All weights are in pounds (for a milled front sight, subtract 0.2 lbs.)
10" - Heavy Bbl. - 2.0 / Fluted Bbl. - 1.9
11.5 " - Heavy Bbl. - 2.2 / Fluted Bbl. - 2.0
11.5x5.5" - Heavy Bbl. - 2.6 / Fluted Bbl. - 2.5
14.5" - Heavy Bbl. - 2.5 / Fluted Bbl. - 2.2
14AK" - Heavy Bbl. - 2.7 / Fluted Bbl. - 2.4
14VO" - Heavy Bbl. - 2.7 / Fluted Bbl. - 2.4
16" - Heavy Bbl. - 2.7 / Fluted Bbl. - 2.3
16 Dissipator" - Heavy Bbl. - 3.0 / Fluted Bbl. - 2.6
20" - Heavy Bbl. - 3.5 / Fluted Bbl. - 3.0
24" - Heavy Bbl. - 3.9 / Fluted Bbl. - 3.1
26" - Heavy Bbl. - 4.0 / Fluted Bbl. - 3.2
And our Military style barrels...
XM177 Bbl. - 1.7 lbs.
M4 Bbl. - 2.0
M4AK Bbl. - 2.2
M4VO Bbl. - 2.2
M4 Dissipator Bbl. - 2.3
20A2 Bbl. - 2.5
-Troy