The Titan no 9 is for the mk1/2 tx200 the Titan no 10 is the correct spring for the mk3 tx the gun will be way over powered with no 9
titan no 9 part no TS009 outside diameter 21mm inner diameter 14.75mm wire thickness 3.3mm number of coils 27 spring length 280mm
titan n0 10 part no TS010 outside diameter 21mm inner diameter 14.8mm wire thickness 3.1mm number of coils 27 spring length 230mm