I've built 2 rifles with AR Performance 16" SOCOM barrels, both shoot sub MOA 5 shot groups with 75 grain Hornady match bullet reloads.
They get new inventory about once a week, and are currently out of SOCOM barrels but have LW barrels in stock.
5R rifling, 1:8 twist, Melonited barrels for a little over $200 shipped.
AR Performance Barrels
I built one upper with a Parallax Tactical FF HG, it's fairly light, very sturdy, and easy on the hands
PXT HG
Of course I only paid $125 for it from a member here apparently in need of cash at the time.
I just bult another upper with a Head Down Provectus FF HG (on sale for $109 at the time)
HG at PA
The mounting system is the best I've seen so far, very sturdy.
Keymod and flush cups, full length top rail, I like it.
One I've been considering is a UTG FF HG w/ full length top rail.
Before you dismiss a UTG product, think about this; made in USA and from the reviews light and well finished, inexpensive, too.
UTG FF HG
Definitely a contender if you have smaller hands (like me).
I have used MI, DD, and Troy FF HGs and honestly the ones I wrote about here seem every bit as good.
Who am I to judge, though, I only spent 20 years in the machine shop and design studio.
Joe