This is amazing and easy to use, simply turn the dial from 1 to 12 and control how much gas pushes your bolt back.


You have to use a straight gas tube (available from Riflespeed).  I went to a 22" barrel that requires a rifle length +2.  The longest available straight gas tube is rifle +1 so I cannot use this anymore.  Will fit any straight gas tube on any AR platform with a .875 (heavy) barrel profile.


$200 new.