The Maxim CQB RDB Roller-Delayed System is a revolutionary upgrade for your AR-9 transforming it from a standard straight blowback system into a high-performance roller-delayed platform. Engineered for maximum efficiency and reliability this system significantly reduces recoil and improves accuracy making it an essential enhancement for precision shooting. Designed to work exclusively with Maxim Defense CQB length buffer tubes it ensures a seamless fit and optimized performance. The roller-delayed mechanism provides smooth cycling action and consistent operation while its unique locking system delays bolt opening until chamber pressure drops further enhancing accuracy and suppressor compatibility. Crafted from durable steel the Maxim RDB system is easy to install and delivers unmatched performance reliability and shooting experience.