The Maxim Defense Roller Delayed Blowback (RDB) Carbine Buffer System for 9mm AR-15/AR-9 rifles (brand part no. 47839) is the buffer assembly for a roller-delayed 9mm AR build. A roller-delayed action holds the bolt closed briefly after firing so that it opens only as chamber pressure falls, and this carbine-length system is the buffer side of that setup. It is made for 9mm Luger rifles that run a mil-spec buffer tube. It is a parts-level choice for a builder who wants a delayed action in a 9mm carbine rather than plain blowback.

Key Specifications

• The system is carbine length, matching the buffer tube length of a standard carbine build.
• The operating design is roller delayed blowback, which delays bolt opening until chamber pressure drops.
• It is made for the 9mm Luger cartridge, the chambering of the AR-9 platform it serves.
• It is sized for most mil-spec AR-15 and AR-9 buffer tubes, so it works with the tube already on a typical build.
• The assembly replaces the buffer and spring in an AR-9 configuration.

Frequently Asked Questions

What does roller delayed blowback do? It delays the bolt from unlocking until chamber pressure has dropped, which is how this action cycles with 9mm ammunition.

Which cartridge and buffer tube does it use? It is made for 9mm Luger AR-15/AR-9 builds and fits most mil-spec buffer tubes.

Buy the Maxim Defense Roller Delayed Blowback (RDB) Carbine Buffer System, 9mm AR-15/AR-9

A buffer system is the part that decides how a carbine cycles, so it pays to buy the one designed for the action. Order this Maxim Defense system from our Lubbock, Texas gun shop for fast shipping, and browse the rest of our rifle stocks selection from Maxim Defense Industries.