Interesting method of gas adjustment

[blue109]

http://micromoa.com/govnah-details

Saw this when I was looking at that match grade dissy barrel. 

[survivalshop]

Not sure what to make of it .  Interesting .

[Magwa]

Hmmmmm I see a xmas present for my supressed 300blk it looks pretty simpleI like the quick change from suppressed to unsuppressed.....if I can gather the bucks I am going to give it a try.....