Best PS4 controller for your venerable PlayStation 4 | Stuff
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Amazon.com: eXtremeRate Transparent Clear 2 Pairs L2 R2 Buttons Extention Trigger for PS4 Controller, Game Improvement Adjusters Extenders for PS4 Controller JDM-030 : Video Games
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Sixaxis - Wikipedia
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PlayStation 4 controller - R2 trigger has came off one of these little hinges (more detail in comments) : r/fixit