Re: Ar-10 Adjustable gas block (low profile)
I would go with Paladin, I know they can do a 3 way, full/semi/off, which makes adjusting easy. If you want to fine tune, you can just get a screw type.
info here:
Paladin Machine Service
3832 Gates Ford Rd.
Kershaw, SC 29067
(803) 475-7542