Just an FYI. NEF got back to me today with some info. I had called requesting the stud thread dimensions of the front bead of a TDC 20 ga. vent rib barrel. I want to replace the front bead with a TruGlo/HiViz something or another.
3-56 is the magic number.
I'm assuming both the 12 ga. and the 20 ga. are the same.
