Chaos Gear Supply SCI-SIX, Suppressor, 5.9x1.68, 556NATO, Black CGS-SCISIX The prime considerations of the CGS SCI-SIX was gas mitigation, flash mitigation, sound mitigation, minimizing the impact of adding a suppressor to a firearms operating system, minimizing point of impact shift, maintaining/improving host firearm precision on target, all while maintaining a minimal size envelope.