$20.00If you plan to do alot of shooting with a sound suppressor (silencer) on your MAX-11 mk2 or MAX-11k, you will definitely want to buy one of these. The Suppressor Gas Block reduces the amount of gasses directed towards your face during shooting. Note: for installation, your lower receiver must have the semi-auto hammer pin holes. Most M-11/9 lower receivers have these. If your lower has a serial number of 84 or lower, it may not.