Tiger Rock AR-15 Collapsible Stock Buffer -3.0 OZ-Carbine Length Black. Replacing the standard buffer often proves difficult and expensive. This one-piece design makes it easy to install and does not impede the rifle's functionality in any way. The AR-15 buffer serves as a standard AR buffer mainly used to absorb the damaging effects of heavy recoil. While many AR-15 buffers (especially stock-type) do the same job this one-piece design does things a little different. The AR-15 compact buffer reduces the rifle's overall weight and as a result reduces the perceived recoil and with that minimizes the shooter's perceived recoil. Installation is easy using the provided screws. Package Contents: Tiger Rock AR-15 Collapsible Stock Buffer Carbine Length Tiger Rock B30: AR-15 Collapsible Stock Buffer -3.0 OZ-Carbine Length (BLACK) Black