A disassembly tool 60 is provided for a handgun 10. The disassembly tool 60 includes spaced aligned upstanding side wall members 74 having a longitudinally extending slot 64 formed therebetween. A diagonally descending wall member 76 is formed on each one of the upstanding side wall members 74 to facilitate positioning of the slot 64 on a guide rod 20 so that a spring assembly 18 is compressed to allow disassembly of the handgun 10. The method of making the tool 60 includes machining a bar 62 to a predetermined length. A longitudinally extending slot 64 is then formed in the bar 62 creating upstanding side wall members 74. The upstanding side wall members 74 are then machined to a predetermined angle so that diagonally descending wall members 76 are formed.