NAGAMAS77 The entire top end of the Cox Conquest and the Taipan TBR are interchangeable. This cylinder has a tapered grind and tapered and lightened piston so the piston fit gets tighter as the piston reaches top dead center (TDC). Cox also sold the muffler, cylinder and high comp. This particular .051 came about when a special order for 300 Medallions was placed on Cox by the National Free Flight Society in the USA.|Life After Slot No Limit