AR-STONER offers replacement components for the AR-15 that are made to strict military specifications. These high quality components provide excellent fit and reliable function in your AR series platforms. These AR-STONER parts are perfect for upgrading existing components or replacing worn or broken parts. Don't waste your time or money on unreliable AR parts, grab a few of the AR-STONER parts today! FeaturesMil-Spec PartLength: 3.25"1 Internal Reciprocating WeightNet Weight: 4.6 - 4.7 OZ Note: Color of polymer tip may vary and does not affect function.