Spitfire is undoubtedly the most trusted name in mechanical broadheads. Spitfires fly straight with pinpoint accuracy and perform better than any other mechanical broadhead thanks to our ultra-sharp Diamize® blades. Renown NAP durability ensures that the Spitfire will stand up. Patented ferrules deliver superior flight; Patented Trophy Tip points hit with bone- crunching results; No O-ring systems. NAP Spitfire Crossbow Broadheads are. The American-made NAP Spitfire Doublecross Crossbow Broadheads use fail- safe blade-retention technology to ensure blades never open in flight, even when .