Get a quality non-adjustable or a more expensive adjustable instead. - ODIN Works Tunable Low Profile Gas Block

The gas block works fine as a normal gas block. The rifle still cycles with the gas block fully closed. There are 2 screws. One is to set the gas amount and then there is a set screw to hold that one in place that screws in front of it. Unfortunately both screws will walk themselves out unless you use Loctite, at which point, it isn't exactly tuneable anymore. This is marketed as a "set it and forget it" which makes me wonder if this was the intended design to begin with. This gas block does give you the ability for some minor tuning but as I said my rifle still cycled with it fully closed. You're probably better off just getting quality, properly gassed, non-adjustable gas block (Faxon, BCM, YHM, ETC.) or a apending more and getting a good adjustable.