Shop › SCO SCO15 UPPER RECEIVER BLK SCO SCO15 UPPER RECEIVER BLK $219.00 SilencerCo SCO15, Stripped Upper Receiver, .223 Remington/556NATO, Black AC5065 Quantity: Add To Cart Added! SilencerCo SCO15, Stripped Upper Receiver, .223 Remington/556NATO, Black AC5065