I got one, it works as described. - TF Tactical Nano Adjustable Gas Block

I was skeptical to try this because there is so little material, but I thought “perfect” for a light weight build that may or may not be canned or suppressed at a later time. I installed it, adjusted it, and it works great. I have shot about 400 rounds so far with zero malfunctions. I am also running a light weight carrier so I wanted to be able to dial down the gas to nearly zero impulse. I don’t give anything 5 stars.