XTS Heavy AR-15 Buffer, 4.5 oz The XTS BUFFER-HW is a heavy buffer for AR-15 rifles with a specified weight of 4.5 ounces. That weight is the central comparison point for this individual buffer. The 4.5-ounce figure describes buffer weight, so it is a useful comparison with the requirements of a replacement part. This item is the buffer component itself. The AR-15 fit designation identifies the rifle platform for which XTS lists it. Key Features Weight: 4.5 ounces Platform: AR-15 rifles Specifications Brand: XTS Model: BUFFER-HW Type: Heavy buffer Shop the XTS Heavy AR-15 Buffer, 4.5 oz at BattleHawk Armory.