Adapter with Shockwave Blade 2.0 Pistol Stabilizer kit for Master Piece Arms & VMAC 9mm. It bolts to your gun and maintains a tight precision fit under rapid fire with the aid of a machined set screw, bolts into the existing rear threaded hole. *This part number for the Adapter, pistol buffer tube and Shockwave Blade. weighs about 12 ounces.*DOES NOT FIT NEWER 9MM MODELS without the threaded hole on the underside at the rear.