Primary Weapons Systems CQB, Comp, 308 Win, Black, 5/8x24 Threads 3CQB58C1 The CQB Compensator is designed to redirect sound forward whereas others redirect to the side. Designed for close quarters combat" specifically law enforcement and military units shooting indoors and at close range" this compensator is gaining popularity for use on short barreled rifles to mitigate sound and blast" while improving overall weapon control.