Fits HUXWRX Muzzle Devices; Compatible with 6mm platforms; Compatible with Muzzle Brake-QD556, QD6, and Flash Hider-QD 556, QD6, in multiple thread patterns; 17-4PH Stainless Steel material; Minimal Volume - Shorter and Lighter, the Flow 6k is optimized for compact weapon systems; HUXWRX Torque Lock is a patented, tool-less locking system that ensures the suppressor will stay securely mounted onto the HUXWRX QD muzzle device; Hearing Safe - The HUXWRX Test Rifles shall not exceed 140 dB ten shot average sound pressure level at shooter's ear during barrel life; Full-Auto Rated - HUXWRX suppressors full-auto rating guarantees the suppressor passes the USSOCOM Reliability Stress Test; Cross-Platform Compatible - HUXWRX QD suppressors can be used on a variety of calibers and rifle platforms; Precision Certified - HUXWRX Suppressors are engineered and tested to meet the highest military accuracy specifications worldwide; No Weapons Mods - Modifications to the bolt, gas tube, buffer or recoil springs, and other timing modifications are unnecessary