Seems to work just fine - Superlative Arms Adjustable Bleed Off Gas Block

This gas block seems to work. The only complaint I have is that the directions on how to tune are a little vague. There seems to be a wide range of settings where I do not notice any difference in cycling or felt recoil. I may just need to spend more time with it to figure out how it best works with my rifle. Overall I would I would buy it again.