This is what all adjustable gas blocks should be! - Seekins Precision Select Adjustable Gas Block

This is by far the best adjustable gas block on the market.

I have this gas block on a 18" 5.56 SPR that I run suppressed and unsuppressed with many different types of factory ammo. Running max pressure 5.56 nato with 77gr rounds while suppressed, I have this gas block lever set on the - setting. If I switch to a slightly lower pressure 5.56 load (55gr), I just go one click towards + and I get perfect function. When I take my suppressor off, I go 1 click past 90 degrees straight up for hot 5.56 loads unsuppressed. Running 55gr .223 or steel cased ammo, I throw the gas block lever to the max + position.

With all these settings, I get absolutely perfect 4 o clock ejection with a nice neat pile of brass next to me. 100% reliability and an extremely smooth recoil impulse (using an h2 carbine buffer and normal carbine spring, rifle length gas system). This gas block makes my rifle the smoothest shooting 5.56 rifle I have ever operated. Spotting hits through my scope is effortless because of how much the adjustable gas block smooths out the recoil. When shooting very consistent match ammo, this gas block allows me to catch all my brass in my boonie hat next to me if I am laying prone. It is extremely consistent and is just awesome.

The best part of this gas block is it's design. You have audible clicks between gas settings when adjusting with the lever, and as long as loctite is applied to the set screw that holds the lever to the post, there is no possible way this gas block can fail or have anything come loose. You don't have to mess with any allen wrenches or small set screws that can back out or strip and cause complete failure of the rifle. It is far better and easier to use than any other gas blocks on the market today.

Seekins really hit a home run with this one. I will be adding this gas block to any gas gun I own from now on. This is what all adjustable gas blocks should be, and it is a very well made and near bombproof design.