Stern Defense RAB-AD Male Assembly Black 008-SD RAB-AD MALE-D2-M. 6 oz Features of Stern Defense RAB-AD Male Assembly Steel internals Hard coat anodized for maximum wear protection Buffer retainer to keep the buffer weight in the tube while disassembled Buffer spacer compatible with all standard-length AR-15 bolts Package Contents: Stern Defense RAB-AD Male Assembly Stern Defense 008-SD RAB-AD MALE-D2-M: RAB-AD Male Assembly Black