Leapers, Inc. - UTG Model 4 Stock Black w/ Buffer, Buffer Tube, & Spring 6-Position Mil-Spec Stock Assembly RBU6BM Model: Model 4 Finish/Color: Black Accessories: w/ Buffer, Buffer Tube, & Spring Type: Stock Manufacturer: Leapers, Inc. - UTG Model: Model 4 Mfg Number: RBU6BM