I'm looking at this right now.
I have some fire-formed AI brass. I'm going to compare how it headspaces to how the factory stuff sits.
I'm also checking the hammer spring and its installation.
Upon firing, should the hammer sit flush against the back of the frame and firing pin? Mine is bouncing back a bit, probably due to the firing pin return, and then going to half-cocked when I release the trigger.
Thanks,