Sig Sauer NG556, Suppressor, 556NATO, Inconel, High Temperature Cerakote Finish, Black, 19.4oz, Quick Detach, Includes QD Mount/Muzzle Break NG556-QD Based on SIG's Next Gen technology, the NG556-QD LO-TOX design minimizes toxic fume exposure from ejection port featuring a monolithic core construction for extreme strength and durability. Sig Sauer's Clutch-Lok secure mounting system delivers a consistent and reliable attachment for long lasting reliability. The NG556-QD features a flash reducing end cap that is designed to lower the overall fire signature of the suppressor.