You can try modding a UL reach trigger to fit. You have to do minor milling so you can actually adjust the trigger properly.
I have one I did but I dont even use it so Ill try to get some pics along with my bumper oring.
Rediscover: "its good to see you didnt take any flying metal objects to your juggular." 13pbstar13: "I dont have tits bro" (true story)