Absolute garbage. - Guntec USA AR-15 Aluminum Low Profile Gas Block

If you want a gas block that’s made of solder then this is for you. Set screws don’t hold a thing and my barrel had indents to help it out! When punching the roll pin into the gas block, the gas block had the same properties as dry solder and basically crumbled and flaked the inside. Leaving metal pieces clogging the hole for the roll pin. I’ve built many ARs and this is the worst gas block I’ve ever used.