There are *lightweight* barrel profiles for AR10 and a lightweight build could be put together. Research will reveal some interesting options.
What Jon said above about muzzle blast in a 16" barrel is mostly true...it's pretty substantial.
But, there is hope.
I have a SS 16" heavy barreled ArmaLite that I assembled, and at first I fired it with the standard A2 flash hider.
It is the reason I wear ear plugs and
ear muffs nowadays.
I wanted to tame the muzzle blast a bit, so I researched and ended up with a Noveske KX3 ($75 used -$125 new) Flaming Pig.
It was worth it!
It really works wonders with directing the muzzle blast down range and makes firing the 16" very pleasant for the shooter and bystanders.
*these are not my pictures, nor my rifles