CMMG DefCan 3 Flash Hider 30 Caliber 5/8X24 Features: CMMG's DefCan Bi-Lock QD Flash Hider allows quick secure attachment or removal of DefCan suppressors. Used independently of a suppressor it is effective at limiting muzzle rise for faster follow-up shots and reducing the loss of night vision in low-light conditions. CMMG DefCan 3 Flash Hider 30 Caliber 5/8X24 Specifications: Caliber: .30 (7.62mm) Weight: 4oz Thread: 5/8-24 Includes Peel Washer