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. The RDB system is not full auto rated.
KEY FEATURES:
- Reduces felt recoil
- Increases reliability
- Minimizes friction for enhanced performance
IMPORTANT INSTALLATION NOTE FOR RDB SYSTEM
To install the Roller Delayed Blowback (RDB) System, your 9mm bolt assembly must have an open channel to allow the guide rod to function properly during firing. For most 9mm bolts, meaning you will need to remove the pinned-in central mass. The central mass must be removable, but the bolt carrier group (BCG) should retain its full length without it, to ensure proper function with the RDB system.
At Maxim Defense, we take pride in designing and manufacturing high-performance firearms, suppressors and accessories that deliver exceptional reliability and durability. Your feedback and positive reviews are important to us, as they help us continually improve our products. If you experience any issues with your Maxim Defense products, please contact us at info@maximdefense.com, and we’ll work with you to resolve the matter as quickly as possible. Please note that we do not cover damage caused by the installation of other manufacturers’ products.





charles wiley –
Very nice! Installed in an Angstadt arms ar9 with a Jk 155 rpx 9 suppressor. Shooting 125gr subsonic. Rifle runs sweet. Installation was super simple.
doug hampton –
GAME CHANGER
I’m running a PSA braced lower with a 9mm blowback upper, and the factory setup (buffer, spring, and BCG weight) was cycling very aggressively. After installing this buffer, the difference was immediate. Recoil is noticeably reduced, cycling is smoother, and overall reliability has improved dramatically. This upgrade also contributes to safer, more consistent operation. Outstanding product—highly recommended!