Based on SIG’s Next Gen technology, the NG556C-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 NG556C-QD features a flash reducing end cap that is designed to lower the overall fire signature of the suppressor.