The Stag 10 Stripped FDE Upper Receiver includes a picatinny rail on the top with a Tang Height of .210 Compatibility: The Stag 10 Stripped Upper Receiver will work with our Stag 10 Upper Receiver Parts Kit or any DPMS upper parts kit. Our upper receiver has the same barrel nut threads as DPMS, accepts DPMS barrels, accepts Stag, Armalite and DPMS BCGS and Charging Handles. It also accepts standard AR Forward Assists. Once matched with our custom Stag Lower, Takedown Pin, Pivot Pin and Takedown Pin Detent, this assembly can be built using standard DPMS components. This product is blemished. Blemishes may include: • Scratches • Minor tool marks • Flaws in finish These products are fully functional. If you don't mind a slight imperfection, this is the perfect product for you. We do not accept returns on blemished products.