ROLLER DELAYED BUFFER (RDB) SYSTEM FOR 9mm AR PLATFORMS ONLY - Maxim Defense's Roller Delayed Buffer (RDB) System transforms your 9mm AR-pattern firearm into a roller-delayed blowback system reducing felt recoil and boosting reliability. - By allowing gas pressure to stabilize before extraction it ensures smoother operation while virtually eliminating friction common in standard buffer systems. - NOTE: The RDB System is designed specifically for 9mm AR platforms and is not compatible with other calibers. - KEY FEATURES: - Reduces felt recoil - increases reliability - Minimizes friction for enhanced performance