SKU: 28076 UPC: 810022021545 MFR#: This PSA stock kit includes an M4 stock, 6-position 7075 T6 milspec diameter buffer tube, buffer spring, Carbine buffer, latch plate, and castle nut. This PSA stock kit includes a PSA M4-style stock, 6-position 7075 T6 milspec diameter buffer tube with dry-film interior coating, buffer spring, Carbine buffer, latch plate, and castle nut. SKU: 28076