Sanwa’s 3rd generation silent JLF-TPRG-8BYT joystick uses their popular and reliable JLF joystick as a foundation however they swap out the standard TP-MA microswitch and PCB combo for a set of Omron D2RV-G-SD3 silent reed switches. These switches are silent rather than clicky which is perfect for quiet operation, however care needs to be taken when disassembling and assembling the joystick as they can easily be damaged.
Please note that Sanwa sells this stick pre-installed with an octogate specific to this joystick. Disassembling the joystick requires removing a sticker that will void the warranty.
Here’s a good Youtube review noting the different sounds between the standard JLF and the silent JLF.