The NBS Receiver Extension Buffer Tube is perfect for upgrading an existing AR-15 A2 Stock or building a new fixed stock AR-15 rifle. This buffer tube is machined to strict standards to provide an excellent fit and reliable function. The NBS buffer tube is machined from aircraft-grade aluminum and given a hard coat anodized finish to withstand years of abuse.Note: Includes buffer tube only. Buffer and buffer spring sold separately.Features Machined from Durable Aluminum Rugged Anodized Finish Fits AR-15 A2 StocksMade In United States of America