The JARD AR Set Trigger will require small (.154) sized anti-walk pins. I'd recommend the Kaw Valley Precision Anti-Walk Pin Kit which can be found by using the link below:
https://www.opticsplanet.com/kaw-valley-precision-anti-walk-pin-kit.html
Not necessarily, depending on your lower, but there are two set screws which screw downward, applying pressure to the pins.