Like others, I purchased this handguard strictly to cover a muzzle device. In that regard, it functions flawlessly. And the price simply cannot be beat. However- and this may be because I purchased the 17" version- there is some notable deflection at the muzzle. The handguard, being completely free float and only supported on one end, cannot hold zero. For my usage, it's low priority, but bear that in mind. Also of note, the barrel nut does have 12 gas ports, located in groups of 3 and found in the 12, 3, 6, and 9 o'clock position (relatively speaking) and due to the thread pitch, I was unable to line a single one up within the recommended torque values. So you may find yourself investing in barrel shims or gronking way down on the nut to get it lined up. Mind you, I'm no professional, this is simply my two cents.
Overall, I'm fairly happy with the product. Again, the price is literally unbeatable and it's exactly what I was looking for. Shame it's coming out of China as I'd prefer to buy American but until American companies attempt to compete, consumers will follow their wallets. I gave the product 5/5 and the shipping, I might add, was actually rather fast. 2 weeks to get from Chicago warehouse to Southern Indiana. Your mileage may vary in that regard.