My 16" heavly modified Bushmaster weights in at 7.5 lbs with a loaded 30 round mag. I find that it transitions from target to target alot faster than a heavy barrel does. Just to list some of the the things that i have on mine: 16" bushy M4 barrel, Miculek comp, flip-up front and rear sights, Bushnell Holo-sight, JP trigger, ASA non-collapsable stock, KA Grip Tube, and the newest is the Arrondondo Magwell.
Stinger Out