Very nice adjustable gas block with click adjustments - Anderson Manufacturing Adjustable Steel Gas Block

I ordered two of these for two of my rifles. They didn't have the Anderson logo on the side like it shows in the pics, but that doesn't matter because they are both going under free float handguards.

These use a spring and detent to keep the adjustment screw from walking. The adjustment screw has four grooves or "flutes" along it that the detent secures into. The adjustment was very tight on both of them to begin with, like it was stuck from being in storage, but once I "unfroze" it, it turns and operates fine.

It has 4 clicks per full revolution of the adjustment screw, and a total of 24 clicks from stop to stop (full open to full closed) for a total of 6 full revolutions.

I would recommend this item and plan on using them on future builds.