I’m looking for a good brake for an upcoming AR10 build using a Noveske 21" barrel. How does the standard Armalite 2-port muzzle brake work in terms of recoil reduction/muzzle flip? It is certainly a cost-effective option…
It’s very good but not great – much, much better than the plain A2 style compensator.

I have an OEM 2-port on a 16-inch AR-10T Carbine, and the Badger FTM on a 22-inch rifle.
“Much better” than the A2 comp…could you please elaborate on that?
It definitely mitigates recoil and helps to keep the muzzle and sights on target. Using both the brake and a heavier buffer helps (me) with follow-up shots.
The A2 is just a flash hider and muzzle decoration – the rifle recoils and moves right and up for me as a right-handed shooter.
There are better brakes, but not for the price.