Volquartsen unique pistol comps are designed for the Mamba and Scorpion Pistols and their associated LLV uppers. They're CNC-machined from billet material to match the upper profile and then finished to match. A captive, knurled nut secures the compensator to the muzzle threads. Volquartsen includes a comp wrench for secure installation and removal. Note: Two washers are included. For installation, the black washer goes towards the comp, and the stainless washer goes towards the pistol.