Simply take your QUICKDRAW trigger system and carefully slide it over the existing PS4 trigger first making sure the original trigger is inside the QUICKDRAW trigger extension. Then slide the rest of the QUICKDRAW grip over the original controller. Then simply adjust the trigger slide underneath the controller using the finger tight adjustment screw. You are now ready to take advantage of the QUICKDRAW and QUICK FIRE triggers at your disposal. Not sure on how to fit the QUICKDRAW? Scan the QR code for a video on how to do it.