Tiger Rock 6 oz Bolt Buffer AR-9mm - Stainless Steel 6 oz. It enables fast easy installation and features the standard AR-15 CLEAN-OUT method for the bolt. For a smooth bolt-to-bore transition ultra lightweight design and hardened case this buffer also reduces felt recoil and therefore accuracy in any 9mm AR build. The 9mm Bolt Recoil Buffer also acts as a timing or loading pin allowing the shooter to adjust for the differences in bolt weight between standard and de luxe bolts. Specifications for Tiger Rock Bolt Recoil Buffer AR-9mm: Manufacturer: Tiger Rock Condition: New Package Contents: Tiger Rock Bolt Recoil Buffer AR-9mm Tiger Rock B9MM-6: 6 oz Bolt Buffer AR-9mm - Stainless Steel 6 oz