This heavy buffer is a high quality replacement component that will provide excellent fit and reliable function in your AR series rifle. Designed specifically for those that need extra help in controlling their weapon, this buffer adds a considerable amount of weight in comparison to the 5.3 ounce standard buffer. Notes: This buffer will not fit in a regular carbine or rifle system, it is designed specifically for use with the new A5 recoil system - attempting to use this buffer in a standard rifle or will result in damage to the firearm and potential injury to the operator.