I am interested in what brand lower that you have? I have thought now for a while that the dimensional tolerances of the various lowers are great enough to allow some differences in trigger performance, ie if the holes are a few thou farther apart does the trigger release easier as there is less engagement and if they are a few thou closer together if it is a harder trigger pull etc. etc.
It is a Del-Ton. Seems flawless but I am not that knowledgeable in the matter. All my uppers fit it great.
