Gas switch for Suppressor

[survivalshop]

Have you seen this , 

[jtallen83]

Surprised it has took this long for others to get in the game, maybe patents held them back. Any pricing on this option?

others like it are the Noveske Switchblock;

https://www.noveske.com/products/switchblock-clamp-on-5-56mm

And LaRue's PST gas block available on their rifles, "The PredatOBR's Port Selector Technology™ (PST) gas block is adjustable, to aid in the optimum function when using a sound suppressor. This special gas block contains a dual port mechanism that is operated by rotating a lever from one side to another. When the lever is rotated to the right-side of the rifle, the gasses are reduced, to compensate for the extra blowback created by the suppressor. When rotated to the left side, the gasses are increased for use without a suppressor.";

https://www.larue.com/products/larue-tactical-14-5-inch-predatobr-7-62/