Use code FIRE at PSA.
https://palmettostatearmory.com/surefire-x300-ultra-1000-lm-led-weapon-light-w-t-slot-mounting-rail-black-x300u-b.html?utm_medium=email&utm_source=daily_deals&utm_campaign=20231106&utm_term=Morning+&utm_content=
Don’t know much about these, but I pulled the trigger and bought one. For $90, it’s worth a try.
http://www.primaryarms.com/cmc-ar-15-ar10-lantac-e-ct1-single-stage-upgrade-trigger-flat-91513