Back story with the delrin piece....
Previous owner(builder) didn't want me to cut the frame and make it single trigger, and I hated the way it looked so I made that block. The plan was to weaver lug that or install a laser sight in there, but it went against the grain of the initial project.... those guns from gun grave.
Matt... trigger isn't ground that is something I machined for that frame, I forget if I used springs or magnets for the return though. I don't remember if I had the large supply of rare earth magnets when that came into the shop.