I have a 16" Mid-gas Wilson combat barrel, syrac adj gas block and JP low mass. Gas block turned all the way down still locks back. I can't say that it is noticeably softer than full mass, non adj gas. But--I've never shot a similar set up in rifle length, and I'm a middle of the pack shooter. It looks great, and works fine but Im not sure the benefit for me justified the cost. Bigger gains came from changing from a chrome lined mil spec barrel to the Wilson, and having JP install their trigger. Just one mans opinion, and YMMV.