AR-STONER offers replacement components for the LR-308. These high quality components provide excellent fit and reliable function. AR-STONER parts are perfect for upgrading existing components or replacing worn or broken parts. This buffer is for use in standard AR-15 carbine tubes using the correct LR-308 carbine buffer spring. This 5.3 ounce buffer is optimized to better balance the recoil of the 308 cartridge with the use of solid tungsten cores.