Primary Weapons Systems Primary Weapons Systems, Flash Suppressing Compensator, 223 Rem, For Short Barreled Rifles, Black 3CQB12A1 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.