Does not work as advertised

No matter how much you tighten down the screw to restrict gas, your bolt will lock back on last round, indicating that there is still plenty of gas being fed back. I also have a different brand adjustable gas block and when that is tightened all the way down, the bolt does not move.

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<br>Guntec handguards are great, I have 3 of them. Guntec gas blocks are a bust. Save your money and get a standard block or spend the money and get one that will work.